LED, Inc. manufactures and sells LED light bulbs, which they guarantee will last at least 2,000 hours of continuous use. LED's engineers randomly select 16 bulbs, plug them in, and record the amount of time they are on before burning out. They find out that the sample mean is 1988 hours with a standard deviation of 32 hours. You can assume the population time before burning out is normally distributed. Suppose the company wants to test the following hypotheses:H0:μ≥2,000vsH1:μ<2,000What distribution would you use to look up the p-value for this set of hypothesis?a. t(32)b. zc. t (15)d. t (23)

Answers

Answer 1

The distribution we would use to look up the p-value is option (c) t(15).

Since the population standard deviation is unknown and the sample size is less than 30, we should use a t-distribution to look up the p-value.

The test statistic can be calculated as

t = (sample mean - hypothesized population mean) / (sample standard deviation / √(sample size))

Substitute the values in the equation

t = (1988 - 2000) / (32 / √(16))

Do the arithmetic operation

t = -3

The degrees of freedom for the t-distribution would be (sample size - 1), which is 15 in this case.

Therefore, the correct option is (c) t(15).

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Related Questions

solve the given differential equation by using an appropriate substitution. the de is homogeneous. (x − y) dx+x dy = 0

Answers

The general solution of the given homogeneous differential equation is: y/x = v = f(x^2 - ln|x|)

To solve the homogeneous differential equation (x - y) dx + x dy = 0 using an appropriate substitution, let's substitute

v = y/x. Then, y = xv and differentiate both sides with respect to x to get dy/dx = x dv/dx + v. Now, substitute y and dy/dx into the original equation:

(x - xv) dx + x(x dv/dx + v) dy = 0
(1 - v) dx + x^2 dv/dx + xv dy = 0

Now, divide the equation by x to obtain:

(1 - v) (dx/x) + x dv/dx + v dy = 0

This is now a separable differential equation. Rearrange the terms to separate the variables:

(1 - v) (dx/x) = -x dv/dx - v dy

Integrate both sides:

∫ (1 - v) (dx/x) = ∫ (-x dv - v dy)

∫ (1 - v) (1/x) dx = - ∫ x dv - ∫ v dy

ln|x| - ∫ v (1/x) dx = -xy - 1/2 y^2 + C

Now, substitute y back in terms of x and v:

ln|x| - ∫ v (1/x) (x dv) = -x(xv) - 1/2 (xv)^2 + C

Simplify and solve for v:

ln|x| - ∫ v dv = -x^2v - 1/2 x^2v^2 + C

Finally, write the general solution in terms of x and y:

y/x = v = f(x^2 - ln|x|)

where f is an arbitrary function.

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Find the general solution to the homogeneous differential equation:

(d2y/dt2)−18(dy/dt)+97y=0

Answers

The general solution to the homogeneous differential equation (d²y/dt²)−18(dy/dt)+97y=0 is y(t) = C₁ [tex]e^3^t[/tex] cos(8t) + C₂ [tex]e^3^t[/tex]sin(8t).

To solve the given differential equation, first, we need to find the characteristic equation by replacing d²y/dt² with r², dy/dt with r, and y with 1. This gives us the quadratic equation r² - 18r + 97 = 0.

Next, find the roots of the characteristic equation using the quadratic formula, which yields r = 3 ± 8i.

Since the roots are complex conjugates, the general solution to the homogeneous differential equation takes the form y(t) = [tex]e^\alpha^t[/tex](C₁cos(βt) + C₂sin(βt)), where α and β are the real and imaginary parts of the complex roots, respectively. In this case, α = 3 and β = 8. Substituting these values, we obtain the general solution y(t) = C₁ [tex]e^3^t[/tex]cos(8t) + C₂ [tex]e^3^t[/tex]sin(8t).

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Construct a 95% confidence interval for the true mean for exam 2 using x = 72.28 and s = 18.375 and sample size of n = 10.

Answers

The 95% confidence interval for the true mean for exam 2 is approximately (60.899, 83.661).

How to construct a 95% confidence interval?

To construct a 95% confidence interval for the true mean for exam 2 using x = 72.28 (sample mean), s = 18.375 (sample standard deviation), and a sample size of n = 10, follow these steps:

1. Identify the sample mean (x), sample standard deviation (s), and sample size (n): x = 72.28, s = 18.375, n = 10.
2. Determine the appropriate critical value (z) for a 95% confidence interval. You can find this value in a z-table or use a standard value: z = 1.96 for a 95% confidence interval.
3. Calculate the standard error (SE) using the formula SE = s/√n: SE = 18.375 / √10 ≈ 5.807.
4. Calculate the margin of error (ME) using the formula ME = z * SE: ME = 1.96 * 5.807 ≈ 11.381.
5. Calculate the lower and upper bounds of the confidence interval using the formulas:
- Lower bound = x - ME: 72.28 - 11.381 ≈ 60.899.
- Upper bound = x + ME: 72.28 + 11.381 ≈ 83.661.

Your answer: The 95% confidence interval for the true mean for exam 2 is approximately (60.899, 83.661).

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Verify the following trigonometric identity using sin2x + cos2x = 1

Answers

The given statement (1/cotx)+cotx = (1/sinxcosx) is true.

What is Trigonometry?

Trigonometry is a branch of mathematics that deals with the relationships between the sides and angles of triangles, particularly right triangles, and the functions based on these relationships. It is widely used in various fields such as engineering, physics, architecture, and navigation to calculate distances, heights, angles, and other geometric properties.

Starting with the left-hand side of the equation:

1/cot(x) + cot(x)

= cos(x)/sin(x) + sin(x)/cos(x) [Using the reciprocal identity]

= (cos²(x) + sin²(x))/(sin(x)cos(x))

= 1/(sin(x)cos(x)) [Using the identity sin²(x) + cos²(x) = 1]

Now, we have shown that the left-hand side simplifies to 1/(sin(x)cos(x)).

Now, we can simplify the right-hand side of the equation using the identity sin(2x) = 2sin(x)cos(x):

1/(sin(x)cos(x))

= 1/(1/2 × 2sin(x)cos(x))

= 2/(2sin(x)cos(x))

= 2/sin(2x)

= 1/sin(2x) + 1/sin(2x)

= (sin(x)cos(x))/(sin(x)cos(x)×sin(2x)) + (sin(x)cos(x))/(sin(x)cos(x)×sin(2x))

= (cos(x))/(sin(2x)) + (sin(x))/(sin(2x))

= (cos(x) + sin(x))/(sin(2x))

= (cos²(x) + 2sin(x)cos(x) + sin²(x))/(2sin(x)cos(x))

= (1 + cos(2x))/(2sin(x)cos(x)) [Using the identity cos(2x) = cos²(x) - sin²(x)]

Thus, we have shown that the right-hand side simplifies to (1 + cos(2x))/(2sin(x)cos(x)).

Since we have shown that the left-hand side simplifies to 1/(sin(x)cos(x)) and the right-hand side simplifies to (1 + cos(2x))/(2sin(x)cos(x)), we can see that the given identity is true.

Therefore,1/cot(x) + cot(x) = 1/(sin(x)cos(x)) = (1 + cos(2x))/(2sin(x)cos(x)).

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PLEASE HELP 30 POINTS Solve for the missing side show work pls!

Answers

The required length of the missing side in the triangle is x = 5 in.

A right-angle triangle is shown in the figure, we have to determine the unknown measure x in the triangle.

Applying the Pythagoras theorem,
12² + x² = 13²
144 + x² = 169
x² = 169-144
x² = 25
x = √25
x = ± 5

Since x = 5, the length can never be negative.

Thus, the requried measure of x in the given triangle is 5.

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given that z is a standard normal random variable, what is the probability that 1.20 ≤ z ≤ 1.85
4678 .
3849 .
8527 .
0829

Answers

the probability that 1.20 ≤ z ≤ 1.85 is approximately 0.0822.To find the probability that 1.20 ≤ z ≤ 1.85, we need to use the standard normal distribution table or calculator.

First, we find the area to the left of 1.85 in the standard normal distribution table, which is 0.9671. Then, we find the area to the left of 1.20 in the standard normal distribution table, which is 0.8849.

To find the probability that 1.20 ≤ z ≤ 1.85, we subtract the area to the left of 1.20 from the area to the left of 1.85:

0.9671 - 0.8849 = 0.0822

Therefore, the probability that 1.20 ≤ z ≤ 1.85 is approximately 0.0822.

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Find the amount of money required for fencing (outfield, foul area, and back stop), dirt (batters box, pitcher’s mound, infield, and warning track), and grass sod (infield, outfield, foul areas, and backstop). Need answers for each area.

Answers

The amount of fencing, dirt and sod for the baseball field are: length of Fencing & 1410.5 ft. Area of the sod ≈ 118017.13ft² Area of the field covered with distance ≈ 7049.6ft²

How did we determine the values?

Area of a circle = πr²

Circumference of a circle = 2πr

where r is the radius of the circle

The area of a Quarter of a circle is therefore;

Area of a circle/ 4

The perimeter of a Quarter of a Circle is;

The perimeter of a circle/4

Fencing = ¼ x 2 x π x 380 + 2 x 15 +2 x 380 + ¼ x 2 x π x 15

Fencing = 197.5π + 190π = 1410.5 feet.

Grass =

π/4 x (380 - 6)² + 87 ² - π/4 × (87 + 30)² + 2 x 380 x 15 + π/4 x 15² - (3/4) x π x 10² - 25π

= 31528π + 18969 = 118017.13

The area Covered by the sod is about 118017.13Sq ft.

Dirt = π/4 x 380 ² - π/4 x (380 - 6)² + π/4 (87 + 30)² - 87² + π100 = (18613π - 30276)/4

= 7049.6

Therefore, the area occupied by the dirt is about 7049.6 Sq ft.

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Do Generation X and Boomers differ in how they use credit cards? A sample of 1,000 Generation X and 1,000 Boomers revealed the results in the accompanying table. a. If a respondent selected is a member of Generation X, what is the probability that he or she pays the full amount each month? b. If a respondent selected is a Boomer, what is the probability that he or she pays the full amount each month? c. Is payment each month independent of generation? PAY FULL AMOUNT EACH MONTH Yes No Total Generation X 420 580 1,000 Boomers 580 420 1,000 Total 1,000 1,000 2,000

Answers

a. The probability that a Generation X member pays the full amount each month is 0.42.

b. The probability that a Boomer pays the full amount each month is 0.58.

c. The payment each month is not independent of generation.

a. To find the probability that a Generation X member pays the full amount each month, divide the number of Generation X members who pay the full amount by the total number of Generation X members in the sample:

Probability (Generation X pays full amount) = (Number of Generation X who pay full amount) / (Total Generation X members)
= 420 / 1,000
= 0.42

b. To find the probability that a Boomer pays the full amount each month, divide the number of Boomers who pay the full amount by the total number of Boomers in the sample:

Probability (Boomer pays full amount) = (Number of Boomers who pay full amount) / (Total Boomers)
= 580 / 1,000
= 0.58

c. To determine if payment each month is independent of generation, compare the probabilities for both generations. If they are equal, then payment is independent of generation. In this case, the probabilities are different (0.42 for Generation X and 0.58 for Boomers), so payment each month is not independent of generation.

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Solve each exponential growth/decay word problem

A savings account balance is compounded
annually. If the interest rate is 2% per
year and the current balance is $1,557.00,
what will the balance be 5 years from
now?

Answers

Answer:

$1.720.34

Step-by-step explanation:

to do this problem we can use the exponential growth formula A=p(1+r)^t

substituting our values we get

A = 1,557.00(1+0.02)^5

after solving the equation for A we get that

A after 5 years will be $1,720.34

write an equation of the ellipse centered at (4, 1) if its minor axis is 8 units long and its major axis is 10 units long and parallel to the x-axis.

Answers

The equation of the ellipse centered at (4, 1) with a minor axis of 8 units and a major axis of 10 units parallel to the x-axis is: (x - 4)²/25 + (y - 1)²/16 = 1

To write the equation of the ellipse centered at (4, 1) with a minor axis of 8 units, a major axis of 10 units, and parallel to the x-axis.
We will use the standard equation of an ellipse in the form:
(x - h)²/a² + (y - k)²/b² = 1
Here, (h, k) represents the center of the ellipse, a is the semi-major axis, and b is the semi-minor axis.
Given that the ellipse is centered at (4, 1), we have h = 4 and k = 1.

Since the major axis is 10 units long and parallel to the x-axis, the semi-major axis a is half of that, which is 5 units.

Similarly, the minor axis is 8 units long, so the semi-minor axis b is half of that, which is 4 units.
Now, we can plug these values into the standard equation of an ellipse:
(x - 4)²/5² + (y - 1)²/4² = 1
Simplify the equation to:
(x - 4)²/25 + (y - 1)²/16 = 1
The equation of the ellipse centered at (4, 1) with a minor axis of 8 units and a major axis of 10 units parallel to the x-axis is:
(x - 4)²/25 + (y - 1)²/16 = 1

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Students in the high school choir sing one of four voice parts. tenors 2 sopranos 9 altos 20 basses 14 What is the probability that a randomly selected singer will be a soprano? Write your answer as a fraction or whole number.

Answers

Okay, here are the steps to solve this problem:

* There are 10 tenors, 9 sopranos, 20 altos, and 14 basses in the choir

* In total there are 10 + 9 + 20 + 14 = 53 singers

* There are 9 sopranos out of the 53 total singers

* To find the probability of a randomly selected singer being a soprano:

* Probability = (Number of desired outcomes) / (Total possible outcomes)

* So Probability = 9/53

Therefore, the probability that a randomly selected singer will be a soprano is 9/53

9/53. add up the number of students (denominator) and out of those students which ones are the soprano (numerator)

if the odds in favor of chris winning the election are 5:3, then what is the probability that a) chris wins. b) chris does not win.
What is the probability that Chris will win the election?

Answers

Hi! The probability that Chris will win the election is 5/8 or 0.625, and the probability that Chris does not win is 3/8 or 0.375. It has been mentioned that the odds in favor of Chris winning the election are 5:3.

a) To find the probability that Chris wins, we can use the formula:
Probability = (Odds in favor) / (Odds in favor + Odds against)
In this case, the odds in favor are 5, and the odds against are 3. So, the probability of Chris winning is:
Probability = 5 / (5 + 3)
Probability = 5 / 8
The probability that Chris wins the election is 5/8 or 0.625.

b) To find the probability that Chris does not win, we can simply subtract the probability of Chris winning from 1:
Probability (Chris does not win) = 1 - Probability (Chris wins)
Probability (Chris does not win) = 1 - 5/8
Probability (Chris does not win) = 3/8 or 0.375

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8) Continuing an upward trend, credit card users collectively paid _______________ in interest payments
9) ________ _________ is when we focus on the first piece of information presented
10) True or False: most Americans tend to use credit cards not for luxury goods, but rather for simple, everyday expenses
11) The CARD Act moved credit card companies from a fee driven model to one that is driven by ______
12) True or False: Revolving, rather than paying off your credit card every month, can build credit faster

Answers

Continuing an upward trend, credit card users collectively paid a staggering amount in interest payments.

What is Anchoring Bias?

Anchoring bias is when we focus on the first piece of information presented, which often influences subsequent decision-making.

True: Most Americans tend to use credit cards not for luxury goods

The CARD Act moved credit card companies from a fee-driven model to one that is driven by transparency.

False: Revolving, rather than paying off your credit card every month, can actually hurt your credit score in the long run.

Answers

For the term 1/(s²+4)(s²+1), the partial fraction decomposition would be A/(s²+4) + B/(s²+1), where A and B are constants that can be solved using algebraic equations.

The Laplace transform of e^(-2πs)sin(t-2π) is (s/(s²+1)² + 4π/(s²+1)). For the term (3s+6)/(s²+4), you can separate it into 3s/(s²+4) and 6/(s²+4), and their Laplace transforms would be (3/2)cos(2t) and (3/2)sin(2t), respectively. Once you have the Laplace transforms for each term, you can use linearity of Laplace transforms to get the solution of the given initial value problem.

Laplace transforms are a mathematical tool used to transform a function of time into a function of complex frequency. This transformation allows for the solving of differential equations, particularly those with initial conditions, by converting them into algebraic equations that can be easily solved.

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Find the value of x.
X
7 feet
43.2°
(triangle)

Answers

The calculated value of x in the triangle is 4.79 feet

Finding the value of x in the triangle

From the question, we have the following parameters that can be used in our computation:

7 feet

43.2°

The value of x in the triangle can be calcuated using the following sine rule

sin(43.2) = x/7

Make x the subject of the above equation

So, we have

x = 7 * sin(43.2)

Evaluate the products

x = 4.79

Hence, the value of x is 4.79 feet

Answers

The 99% confidence interval is:

p-hat ± z*SE = = (0.4716, 0.5664)

How to obtain 99% confidence interval?

We can use the formula for calculating confidence intervals for a proportion:

p-hat ± z*SE

where p-hat is the sample proportion, SE is the standard error, and z is the z-score corresponding to the desired level of confidence.

For a 95% confidence interval, the z-score is 1.96 (from a standard normal distribution table).

Using the given values, we have:

p-hat ± z*SE = 0.519 ± 1.96(0.0184) = (0.4829, 0.5551)

To find the 99% confidence interval, we need to use a z-score of 2.576 (from the standard normal distribution table).

So, the 99% confidence interval is:

p-hat ± z*SE = 0.519 ± 2.576(0.0184) = (0.4716, 0.5664)

Therefore, the answer is B. (0.4716, 0.5664).

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ind the values of k for which the system has a nontrivial solution. (Enter your answers as a comma-separated list.)
x1 + kx2 = 0
kx1 + 9x2 = 0

Answers

In linear algebra, the determinant is a scalar value that can be computed from a square matrix.

To find the values of k for which the system has a nontrivial solution, we need to first analyze the given system of linear equations:

x1 + kx2 = 0
kx1 + 9x2 = 0

A nontrivial solution means there exists a solution where x1 and x2 are not both equal to zero. We can find such solutions by finding the determinant of the coefficients matrix and setting it equal to zero:

| 1 k |
| k 9 |

The determinant is calculated as follows:

Determinant = (1 * 9) - (k * k) = 9 - k^2

For a nontrivial solution, the determinant must be equal to zero:

9 - k^2 = 0

Now, solve for k:

k^2 = 9
k = ±3

So the values of k for which the system has a nontrivial solution are k = -3 and k = 3. Your answer: -3, 3

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2074-Set B Q.No. 20 Following information are provided related to wages: Monthly working days Hourly output..... Required: Total wage amount of the worker 26 days 4 units following particulars are given Working hour per day Wage rate per unit 8 hours .Rs. 10 [2] Ans: Rs. 8,320

Answers

Complete compensation= 832 individual items x Rs10/unit coming out to be: Rs. 8320

How to solve

To determine the aggregate salary of a laborer, we will begin by computing the whole quantity of units manufactured per calendar month and then increase it by the wage rate for each unit.

Total units produced every month:

Monthly business days = 26

Productivity every hour = 4 individual items

Quantity of daily working hours = 8 hours

Units generated in one day = Productivity every hour multiplied by the Quantity of daily working hours

Units generated in one day are equal to 4 units/hour x 8 hours/day totalling= 32 individual items/day

Whole number units made each month = Units produced every day multiplied Monthly occupation days

Entire units produced each calendar month are equivalent to 32 individual items/day x 26 days which equals= 832 individual items/month.

The wage rate obtained receives Rs.10/individual item

Full pay gained is ascertained using Total units produced every month multiplied Wage rate Ruppees/Rs.10 for every unit.

Complete compensation= 832 individual items x Rs10/unit coming out to be: Rs. 8320

Answers

The given differential equation is an Euler equation, the general solution is y = c1 + c2/[tex]x^4[/tex] and the singular point of the differential equation is x = 0

How to find the general solution and singular point?

You are correct, this is an Euler equation. To solve it, we can make the substitution y = [tex]x^r[/tex]. Then we have:

y? = r[tex]x^(^r^-^1^)[/tex]y?? = r(r-1)[tex]x^(^r^-^2^)[/tex]

Substituting these into the original equation, we get:

x²(r(r-1)[tex]x^(^r^-^2^)[/tex]) + 5x(r[tex]x^(^r^-^2^)[/tex]) + 4[tex]x^r[/tex]= 0

Simplifying, we have:

r(r+4)[tex]x^r[/tex] = 0

Since [tex]x^r[/tex] is never zero, we must have r(r+4) = 0. This gives us two possible values for r: r = 0 and r = -4.

For r = 0, we have y = c1, where c1 is an arbitrary constant.For r = -4, we have y = c2/[tex]x^4[/tex], where c2 is another arbitrary constant.

Thus, the general solution is:

y = c1 + c2/[tex]x^4[/tex]

This solution is valid in any interval not including the singular point x = 0, which is the singular point of the differential equation.

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Q- 2
Use the graph to answer the question.

Graph of polygon ABCDE with vertices at negative 3 comma 3, negative 3 comma 6, 1 comma 6, 1 comma 3, negative 1 comma 1. A second polygon A prime B prime C prime D prime E prime with vertices at 11 comma 3, 11 comma 6, 7 comma 6, 7 comma 3, 9 comma 1.

Determine the line of reflection.

Reflection across x = 4
Reflection across y = 4
Reflection across the x-axis
Reflection across the y-axis

Answers

All the midpoints lie on a vertical line passing through x = 4. This means that the line of reflection is the vertical line x = 4, which corresponds to a reflection across the y-axis.

What is a polygon?

A polygon is a closed, two-dimensional structure made up of three or more straight line segments in geometry.

Each line segment forms an angle with the next one, and the point where two segments meet is called a vertex of the polygon.

The most common polygons are triangles (3 sides), quadrilaterals (4 sides), pentagons (5 sides), hexagons (6 sides), heptagons (7 sides), octagons (8 sides), and so on. Polygons with more than 10 sides are usually named using the Greek numerical prefixes (e.g., a 12-sided polygon is called a dodecagon).

To determine the line of reflection that maps the polygon ABCDE onto the polygon A' B' C' D' E', we need to identify a line that is equidistant from the corresponding vertices of both polygons. We can start by finding the midpoint between each pair of corresponding vertices:

Midpoint between A(-3, 3) and A'(11, 3) is ((-3 + 11)/2, (3 + 3)/2) = (4, 3)

Midpoint between B(-3, 6) and B'(11, 6) is ((-3 + 11)/2, (6 + 6)/2) = (4, 6)

Midpoint between C(1, 6) and C'(7, 6) is ((1 + 7)/2, (6 + 6)/2) = (4, 6)

Midpoint between D(1, 3) and D'(7, 3) is ((1 + 7)/2, (3 + 3)/2) = (4, 3)

Midpoint between E(-1, 1) and E'(9, 1) is ((-1 + 9)/2, (1 + 1)/2) = (4, 1)

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25. find the exact value of each expression. a. cos(-10pi/3)

Answers

The exact value of the expression cos(-10pi/3) is -1/2.

How to find the exact value of the expression?

To find the exact value of cos(-10pi/3), follow these steps:

1. Determine the equivalent positive angle: Since the cosine function has a period of 2pi, we can add multiples of 2pi to the angle until we get a positive angle. In this case, we add 4pi (since 4pi = 12pi/3) to get the equivalent positive angle:
(-10pi/3) + (12pi/3) = 2pi/3.

2. Find the cosine value of the positive angle: Now, we find the cosine value of the positive angle 2pi/3. Using the unit circle, we can determine that cos(2pi/3) = -1/2.

So, the exact value of the expression cos(-10pi/3) is -1/2.

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4:14=14:?
What does ? equal to

Answers

49
14 divided by 4 = 3.5
14x3.5=49

PLEASE HELP!! NEED BY TMR!
Select all the relationships which can be represented by an equation from y=rx where r is the rate and x & y describe the quantities listed.
1) The relationship between the amount of bird food used by a zoo and number of fish at the zoo.
2) The relationship between the price paid for hamburgers and the number of hamburgers bought.
3) the relationship between distance traced by a truck and the time the truck was driven.
4) The relationship between the size of a car's
gas tank and the car's average speed.

Answers

The relationship between the price paid for hamburgers and the number of hamburgers bought.The relationship between distance traced by a truck and the time the truck was driven.

What are the relationships?

The two variables y and x need to be in proportion for the equation y=rx to be valid. This implies that y must rise or decrease in a consistent ratio dictated by the value of r when x increases or decreases.

The change in y is therefore directly proportional to the change in x.

Thus, the change that we have can only be represented by the variables in (2) and (3) above.

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Question Progress
Homework Progress
Find the exact values of the following, giving your answers as fractions
a) 4¹
b) 2³
c) 3

Answers

The exact values using law of negative exponents and reciprocals are:

a) 4⁻¹ = 1/4

b) 2⁻³ = 1/8

c) 3⁻⁴ = 1/81

How to find the reciprocal of numbers?

The law of negative exponents and reciprocals states that:

Any non-zero number that is raised to a negative power will be equal to its reciprocal raised to the opposite positive power. This means that, an expression raised to a negative exponent will be equal to 1 divided by the expression with the sign of the exponent changed.

a) The number is given as: 4⁻¹

Applying the law of negative exponents and reciprocals, we have:

4⁻¹ = 1/4¹

= 1/4

b) The number is given as: 2⁻³

Applying the law of negative exponents and reciprocals, we have:

2⁻³ = 1/2³

= 1/8

c) The number is given as: 3⁻⁴

Applying the law of negative exponents and reciprocals, we have:

3⁻⁴ = 1/3⁴

= 1/81

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Correct question is:

Find the exact values of the following, giving your answers as fractions

a) 4⁻¹

b) 2⁻³

c) 3⁻⁴

Determine the intercepts of the line.
Do not round your answers.

y+5=2(x+1)

Answers

To find the intercepts of the line represented by the equation:

y + 5 = 2(x + 1)

We can rewrite the equation in slope-intercept form, which is y = mx + b, where m is the slope of the line and b is the y-intercept.

First, we can simplify the equation:

y + 5 = 2x + 2

Subtracting 5 from both sides, we get:

y = 2x - 3

So, the slope of the line is 2.

To find the y-intercept, we can set x = 0 and solve for y:

y = 2(0) - 3
y = -3

Therefore, the y-intercept is (0, -3).

To find the x-intercept, we can set y = 0 and solve for x:

0 = 2x - 3
3 = 2x
x = 3/2

Therefore, the x-intercept is (3/2, 0).

Find the open interval(s) wher the followign function is increasing, decreasing, or constant. Express your answer in interval notation.

Answers

The open interval where the function is increasing at (-∞, ∞), decreasing at 0, or constant at 3.

Here we have the graph and through the graph we have to find the open interval(s) where the following function is increasing, decreasing, or constant.

While we looking into the give graph we have identified that the function of the graph is determined as.

=> y = 3x + 2

To determine whether the function y = 3x + 2 is increasing, decreasing, or constant, we can analyze its first derivative.

The first derivative of y = 3x + 2 is y' = 3.

As the first derivative is a constant (y' = 3), the original function is continuously increasing for all values of x, and there are no intervals in which it is decreasing or constant.

Thus, the open interval where y = 3x + 2 is increasing is (-∞, ∞).

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I dont understand so an explanation would be amazing

Answers

Answer: 7≤x≤9

Step-by-step explanation:

Explanation is in image but i forgot to write final answer form. It's up top.

A manufacturer is developing a new type of paint. test panels were exposed to various corrosive conditions to measure the protective ability of the paint based on the results of the test the manufacturer has conducted the time in life before corrosive failure for the new paint is 155 hours with a standard deviation of 27 hours at the manufactures conclusions are correct find the probability that the paint on a sample of 65 test panels will have a mean life before corrosive failure of less than 144 hours. round your answer to four decimal places.

Answers

The probability that the paint on a sample of 65 test panels will have a mean life before corrosive failure of less than 144 hours is approximately 0.0005 or 0.05%.

To find the probability that the paint on a sample of 65 test panels will have a mean life before corrosive failure of less than 144 hours, we will use the Central Limit Theorem (CLT). The CLT states that the sampling distribution of the sample mean approaches a normal distribution as the sample size increases, regardless of the population distribution.

Given:
- Mean life before corrosive failure (μ) = 155 hours
- Standard deviation (σ) = 27 hours
- Sample size (n) = 65 test panels
- Target mean life before corrosive failure (x) = 144 hours

First, we need to calculate the standard error (SE) of the sample mean:

SE = σ / √n = 27 / √65 ≈ 3.343

Next, we will calculate the z-score for the target mean life of 144 hours:

z = (x - μ) / SE = (144 - 155) / 3.343 ≈ -3.293

Now, we will use the standard normal distribution table or a calculator to find the probability that the sample mean life is less than 144 hours:

P(z < -3.293) ≈ 0.0005

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A recent conference had 875 people in attendance. In one exhibit room of 60 people, there were 46 teachers and 14 principals. What prediction can you make about the number of principals in attendance at the conference?

There were about 204 principals in attendance.
There were about 266 principals in attendance.
There were about 671 principals in attendance.
There were about 815 principals in attendance.

Answers

Option A. There were about 204 principals in attendance is correct answer.

What is proportion?

A ratio that compares a part to the whole is a percentage. When describing the relative frequency of a particular outcome in a population or sample, it is frequently employed in statistics. For instance, if a sample of 100 persons includes 30 women, we can say that the percentage of women in the sample is 30%, or 0.3. Based on the sample data, proportions can be used to forecast and infer things about the population. For instance, if we choose a person at random from the population, the percentage of women in the population is probably quite similar to the percentage of women in the sample. Moreover, proportions can be utilised to contrast various groups.

For the given situation using proportion we have:

Proportion of principals = 14/60 = 0.2333.

Now, principals in conference are:

875 x 0.2333 = 204.13 = 204

Hence, Option A. There were about 204 principals in attendance is correct answer.

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Option A. There were about 204 principals in attendance is correct answer.

What is proportion?

For the given situation using proportion we have:

Proportion of principals = 14/60 = 0.2333.

Now, principals in conference are:

875 x 0.2333 = 204.13 = 204

Hence, Option A. There were about 204 principals in attendance is correct answer.

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Calculate the dimensions of the room on the blueprint.For a painting, the ratio of the length to the width is 5:3. The painting is 45 cm wide.
How long is the painting?

can you teach me how to solve it?

Answers

The painting is 75 cm long, if the painting is 45 cm wide.

Calculating how long is the painting?

From the question, we have the following parameters that can be used in our computation:

Ratio of the length to the width is 5:3. T

This means that

Length : Width = 5 : 3

The painting is 45 cm wide.

So, we have

Length : 45 = 5 : 3

Express as a fraction

So, we have

Length/45 = 5/3

Evaluate the above expression

so, we have the following representation

Length = 75

Hence, the length is 75