Please help with these 3 questions! Will give brainliest and 25 points.

Answer: -1/2

Step-by-step explanation:

Use double-angle identities:

cos(2θ)=cos^2θ−sin2^θ

cos(2θ)=1−2sin^2θ

cos(2θ)=2cos^2θ−1

sin(x)=1/2

cos(2x)=1−2sin^2x=1−2(1/4)=1/2

cos(4x)=2cos2^(2x)−1=2(1/4)−1=-1/2

Answer: cos4x=-1/2 if sinx=1/2.

Step-by-step explanation:

[tex]sinx=\frac{1}{2}\\ x=\frac{\pi }{6} .\\4x=4*\frac{\pi }{6}=\frac{2\pi }{3}.\\ cos4x=cos\frac{2\pi }{3}=-\frac{1}{2} .[/tex]

Answer:

Step-by-step explanation:

Most of the questions can be answered by comparing the given equation to vertex form.

The vertex form of the equation for a parabola is ...

  y = a(x -h)² +k

where 'a' is a vertical scale factor, and (h, k) is the vertex. The sign of 'a' determines whether the parabola opens upward or downward.

When we compare the given equation to the vertex form, we can easily see the values of 'a' and (h, k).

  y = -2(x -5)² +3 . . . . . . . given equation

  y = a(x -h)² +k . . . . . . . vertex form

The parameters are ...

  a = -2, (h, k) = (5, 3)

We notice ...

The axis of symmetry is the vertical line through the vertex. It has the equation ...

  x = h

  x = 5 . . . . equation of the axis of symmetry

The sign of 'a' is negative. This means that large x-values will result in large negative y-values. The parabola opens downward.

When the curve opens downward, it means the vertex is the highest point on the curve. The maximum is the y-value of the vertex: k. There is no minimum.

The maximum is y = 3.

The y-intercept is where the graph crosses the y-axis. It can be found by setting x=0, and computing the value of y:

  y = -2(0 -5)² +3

  y = -2(25) +3 = -50 +3

  y = -47 . . . . the y-intercept.

The ordered pair for the point there is (0, -47).

__

We show the graph so you can see how these features relate to the shape of the graph and points on it.

The fully factorized version of  -x-5 is [tex]-1 \times (x+5)[/tex].

What is Factorization?

Usually, factorization or factoring means writing a number (or another mathematical object) as a product of minor or more uncomplicated objects of the same kind.

Given -x-5 is a linear expression.

For factorizing, first, make the coefficient of x positive. For this take -1 common.

⇒ -x-5 = [tex]-1\times(x+5)[/tex]

Now take the greatest common divisor (gcd) of absolute values of coefficients in x+5.

⇒ gcd(1,5) = 1.

Now take gcd 1 common in the expression.

⇒ [tex]-1\times1\times(x+5)[/tex]

⇒ [tex]-1\times(x+5)[/tex].

∴ The fully factorized version of -x-5 is [tex]-1\times(x+5)[/tex].

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Answer:

10

Step-by-step explanation:

proportion

35 ÷ 7 = 5

2 x 5 = 10

The height of the cone is 24 cm.

The distance along the curved surface, measured from the edge at the top to a point on the circumference of the circle at the base, is known as the slant height of an object (such as a cone or pyramid). In other words, the slant height, represented either as s or l, is the shortest distance that may be traveled along the surface of the solid.

Slant height(l)=26cm

Radius(r)=10cm

It is known that, [tex]l^{2}=r^{2}+h^{2}[/tex]

Here, h is the height of the cone.

On substituting the values,

[tex]26^{2}= 10^{2}+h^{2}[/tex]

[tex]\\676=100+h^{2}\\[/tex]

[tex]h^{2}=676-100\\[/tex]

[tex]h^{2}=576\\[/tex]

[tex]h=\sqrt{576}\\[/tex]

h=24

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Answer:

-4 and -5

Step-by-step explanation:

is what i got from what i did

The parabola intersects x axis between -5 & -4 .

∴ The vertex of a parabola is located at (1.-7)

∵the parabola is symmetric  about the x = 1.

∴ The parabola intersects the axis between 6 & 7 .

            6 - 1 = 5               7 - 1 = 6

           1 - 5 = 4                 1 - 6 = 5

Therefore, the parabola intersects x axis between -5 & -4 .

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Answer:

x = 4

Step-by-step explanation:

The ages now are 5x and 7x.

The ages in 4 years are 5x + 4 and 7x + 4.

5x + 4 + 7x + 4 = 56

12x + 8 = 56

12x = 48

x = 4

[tex]\huge\underline{\red{A}\green{n}\blue{s}\purple{w}\pink{e}\orange{r} →}[/tex]

Step-by-step explanation:

• Given —

Age of Roony = 5x

Age of Herald = 7x

• After four years —

Age of Roony = (5x + 4)

Age of Herald = (7x + 4)

• Now, According to the question —

→ (5x + 4) + (7x + 4) = 56

→ 12x + 8 = 56

→ 12x = 56 - 8

→ 12x = 48

→ x = 4

Answer:

Half of the perimeter is 300 feet.

If 100 feet are in the width, then 200 feet are in the length

Step-by-step explanation:

Perimeter is the sum of the lengths and the widths of the rectangle.

So P= l + l + w + w

perimeter is 600 and the width is 100.

so substituting in

600= 100 + 100 + l + l

600 = 200 + 2 l

solve for l

l = 200

hope this helps

Answer:

150 feet

Step-by-step explanation:

Length of playground = L + L + B + B

600 = 100 + 100 + 2L

600 = 200 + 2L

600 - 200 = 2L

300 = 2L

L = 300/2

L = 150

Therefore, the length of the playground is 150 feet.

FALSE

Exponential growth is a pattern of data that shows sharper increases over time. In finance, compounding creates exponential returns. Savings accounts with a compounding interest rate can show exponential growth.

One of the best examples of exponential growth is observed in bacteria. It takes bacteria roughly an hour to reproduce through prokaryotic fission. If we placed 100 bacteria in an environment and recorded the population size each hour, we would observe exponential growth

First, population size is influenced by the per capita population growth rate, which is the rate at which the population size changes per individual in the population. This growth rate is determined by the birth, death, emigration, and migration rates in the population.

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Exponential growth depends on the per capita growth rate (rmax) of a population gradually increasing over time.

The given statement is false.

Exponential growth is a continuous boom or lower in a populace in which the price of change is proportional to the range of people at any given time.

It is growth that maintains acceleration with time and is a J-shaped curve. The intrinsic price of an increase in a populace is calculated by including the dying rate and the birth price.

Divide both sides by N and you get the growth rate per number of individuals ("per capita"): Because r = rmax [1-(N/K)] in the logistic model, we can substitute r: Thus, r equals the per capita growth rate.

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[tex]f(x) = 5x {}^{3} - 2x \\ g(x) = 3x {}^{3} [/tex]

[tex] \frac{f(x)}{g(x)} = \frac{5x {}^{3} - 2x }{3x {}^{3} } = \frac{x(5x {}^{2} - 2)}{3x {}^{3} } = \frac{5x {}^{2} - 2}{3x^2} [/tex]

[tex]f(g(x)) = 5( 3x {}^{3} ) {}^{3 } - 2(3x {}^{3} ) \\ f(g(x)) = 135x {}^{9} - 6x {}^{3} [/tex]

[tex]g(f(x)) = 3(5x {}^{3} - 2x) {}^{3} \\ g(f(x)) = 3(125x {}^{9} - 150x {}^{7} + 60x {}^{5} - 8x {}^{3} ) \\ g(f(x) )= 375x {}^{9} - 450x {}^{7} + 180x {}^{5} - 24x {}^{3} [/tex]

The simplified form of the expression ( (2⁻²)(3⁴) )⁻³ × ( (2⁻³)(3²) )²  is  [tex]\frac{1}{3^8}[/tex].

Hence, option B is the correct answer.

Given the expression;

( (2⁻²)(3⁴) )⁻³ × ( (2⁻³)(3²) )²

First, we use the properties of exponents.

( 2⁻²ˣ⁻³ × 3⁴ˣ⁻³ ) × ( 2⁻³ˣ² × 3²ˣ² )

( 2⁶ × 3⁻¹² ) × ( 2⁻⁶ × 3⁴ )

We take out the parentheses, such that;

2⁶ × 2⁻⁶ × 3⁻¹² × 3⁴

Note that: 2⁶ × 2⁻⁶ = 1, as [tex]2^6*2^{-6}=2^{6+(-6)}=2^0=1[/tex]

Hence, we have

1 × 3⁻¹² × 3⁴

3⁻¹²⁺4

3⁻⁸

Next, we express with positive exponent

[tex]\frac{1}{3^8}[/tex]

The simplified form of the expression ( (2⁻²)(3⁴) )⁻³ × ( (2⁻³)(3²) )²  is  [tex]\frac{1}{3^8}[/tex].

Hence, option B is the correct answer.

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cos(20°) is the correct answer.

Congratulations! This is the unit circle. Literally everyone hates this. Everyone takes this in Trigonometry though, and it's required. I literally failed Trigonometry because of this and had to retake it when getting my degree in Mathematics.

So, what is the x-coordinate of this? Well, for any angle or (angle in triangle) [tex]\alpha[/tex], the coordinates are always ([tex]cos(\alpha), sin(\alpha)[/tex]).

In this case, angle [tex]\alpha[/tex] is 20°, and so the x-coordinate will be cos(20°) while the y-coordinate will be sin(20°).

Hope this helped!

Answer: cos 20

Step-by-step explanation:

A triangle is a three-edged polygon with three vertices. The length of the side MN is 3 cms.

A triangle is a three-edged polygon with three vertices. It is a fundamental form in geometry. The sum of all the angles of a triangle is always equal to 180°.

The triangle formed by MN, MO, NO is an equilateral triangle, with the length of each side of the triangle equal to the radius of the triangle. Therefore, the length of MN will be,

MN = r

Now, the length of arc MN can be written as,

2 × π × r × (60° /360°) = π

r = 360 / (60 × 2)

r = 3

Hence, the length of the side MN is 3 cms.

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Answer: 6

Step-by-step explanation:

By the geometric mean theorem,

[tex]\frac{BD}{3}=\frac{27}{BD}\\\\(BD)^{2}=81\\\\BD=9\\\\\implies x=9-3=6[/tex]

Answer:

x = 6

Step-by-step explanation:

BD is the height of the triangle.

We can find the height of this triangle using one of the Euclidian Theorem:

h^2 = AD*DC rewrite the equation using the given information

(x + 3)^2 = 3*27 multiply

(x + 3)^2 = 81 find the root of both sides

x + 3 = 9 subtract 3 from both sides

x = 6

Answer:

Step-by-step explanation:

a = 12 mi

b ≈ 14.0 mi

c = 7 mi

m∠A ≈ 59.0 °

m∠B ≈ 91°

m∠C ≈ 30.0 °

The lengths of the triangle are:

a = 12 mi

b ≈ 14.0 mi

c = 7 mi

And the angles of the triangle are :

m∠A ≈ 59.0°

m∠B ≈ 91°

m∠C ≈ 30.0°

What are the angles in a triangle?

Every triangle has interior angles that total 180.

Angles in a triangle are the total (sum) of the angles at each of its three vertices.

Given, in a triangle ∠B is = 91°

length of c = 7 mi

              a = 12 mi

We need to find the missing angles and side length of b.

⇒ b² = a² ₊ c² ₋ 2accosB

⇒ b/sinB = a/sinA = c/sinC

b² = 12² ₊ 7² ₋ 2(12)(7)cos91°

b² = 144 ₊ 49 ₋ 2(84)cos91°

b² = 193 ₋ 168 cos 91°

b² = 195.856

b=√195.856

b = 14.0 mi

⇒14.0/sin91° = 12/sinA

⇒ sinA = 12sin91°/14.0

sin A = 0.857

A = arcsin(0.857)

A = 59.0°

∴ C = 180° ₋ (sum of two angles in a triangle)

C = 180 ₋ (91° ₊ 59°)

C = 180 ₋ 150°

C = 30°

Hence we get the angles in the triangle as m∠A = 59.0°, m∠B = 91° and  m∠C = 30°

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The confidence interval which shows 90% confidence level for the mean and assumed standard deviation is (2.94 meals, 3.0565 meals).

Given standard deviation=1.4. Sample size =1271, mean=3.

We have to find the confidence interval for 90% confidence level.

We have to find out α level that is the subtraction of 1 by the confidence interval divided by 2.

α=(1-0.90)/2

=0.05

Now we have to find z in the z table as such z has a p value of 1-α so it is z with p value of 1-0.05=0.95

Z=1.44 from z table.

Now find M as such that

M=z* st/[tex]\sqrt{n}[/tex]

where st is standard deviation ,n is sample size.

M=1.44*1.4/[tex]\sqrt{1271}[/tex]

=1.44*1.4/35.65

=2.016/35.65

=0.0565

Lower end= mean -M

=3-0.0565

=2.94

Upper end=Mean+ M

=3+0.0565

=3.0565

Hence the confidence interval showing 90% confidence level is (2.94,3.0565).

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Answer:

1)The equation is 3^N, where N starts at 4 and goes down 1 each time

2) 1 would be the 5th term

Step-by-step explanation:

3^4=81

3^3=27

3^2=9

3^1=3

3^0=1

Answer:

Last option, y = -4/3x - 2/3

Step-by-step explanation:

The equation of the line is written in the slope-intercept form,

y = mx + b

where m represents the slope

number that describes both the direction and the steepness of the line

slope = rise/run

           b represents the y-intercept  

point where crosses the y-axis

Given:

Let change 3x - 4y = 2 into y = mx + b form,

3x - 4y = 2

subtract 3x from both sides,

3x - 3x - 4y = 2 - 3x

- 4y = 2 - 3x

divided both sides by -4 to get y alone,

- 4y / -4 = 2 - 3x / - 4

  y = (3x / 4) - (2 / 4)

→ y = (3/4)x - (1/2)

Slope of perpendicular lines to another is the negative reciprocal

(ex. slope of 2 becomes -1/2)

So for y = (3/4)x - (1/2) the slope will be,

slope = -4/3

We need to find b (y-intercept),

we know it passes through point (1, - 2)

a point is (x, y) format

y = -(4/3)x + b

plug in the point (1, - 2),

-2 = -4/3(1) + b

-2 = -4/3 + b

add 4/3 to both sides to get b alone,

-2 + 4/3 = -4/3 + 4/3 + b

-2/3 = b

the perpendicular line equation is,

y = -4/3x - 2/3

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932°F to 36032°F

Celsius and Fahrenheit are both measures of temperature. However, Celsius is a metric measurement, and Fahrenheit is used in the USA primarily.

Conversion Formula

To convert the Celsius measurements to Fahrenheit we can use the formula:

So, in this formula, you can plug in whatever Celsius value you have in and solve for Fahrenheit. To convert from F to C you can use the second formula:

Solving for Fahrenheit

Now that we have the formula, we can plug in the 2 Celsius values to find the new range.

First, plug 500°C in

Next, multiply the terms within the parentheses

Finally, add the last terms

Then, plug in 20000°C

Next, multiply the terms within the parentheses

Lastly, add the terms together

This means that, in Fahrenheit, the temperature range of the welder's electrical arc is 932°F to 36032°F. This is a total range of 35100°F.

Answer:

16yd²

Step-by-step explanation:

We only want to focus on the rectangles with carrots. Draw a line down the middle of the shape, giving you 2 recntangles for carrots. Let's start with the big one on the right.

It has a length of 2 and a height of 7. So the area is 14 square yards

The second rectangle

It has a height of 1 yard and a length of 2 yards so an area of 2 square yards.

Finally, 14 + 2 = 16yd²

The distance Tim drives is 300 kilometers


Average speed= 80 km

Time= 3 hours 45 minutes (15/4 hours)

Distance= Average speed/time

= 80 × 15/4

= 1200/4

= 300 kilometers

Hence the distance Tim drives is 300 kilometres

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Answer:

-0.7

Step-by-step explanation:

Given x - y = 0.7

We will assign x and y random values that has a difference of 0.7

x = 1.3

y = 0.6

Using these 2 values,

y-x = 0.6-1.3

= -0.7

As you can see here , you will get a reversed value when you reverse the expression.

so he paid Rs 170 for VAT

total amount paid = 170 x 10 = 1700

discount is 15%

so therefore

amount before discount = 1700/(1–0,15) = 2000

discount = 2000 x 15% = Rs 300

The 15% discount amount for the Nepali flag is 255 rupees.

The percentage is calculated by dividing the required value by the total value and multiplying by 100.

Example:

Required percentage value = a

total value = b

Percentage = a/b x 100

Example:

50% = 50/100 = 1/2

25% = 25/100 = 1/4

20% = 20/100 = 1/5

10% = 10/100 = 1/10

We have,

VAT = 10%

Discount = 15%

10% = 170 rupees

Multiply 15/10 on both sides.

15/10 x 10% = 15/10 x 170

15% = 255 rupees.

Thus,

The discount amount is 255 rupees.

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The recursive formula is mathematically given as

a_n=1266.77e^n

Generally, the equation for the decay is  mathematically given as

[tex]at=a_oe^{-\lambda t}[/tex]

Hence

a1=1400e^{-0.1 (1)}

In conclusion,

[tex]a_n=1400e^{-0.1 (n)}\\\\a_n=1266.77e^n[/tex]

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The difference between causation and correlation is that, Causation is characterized by cause-and-effect while correlation establishes a probable relationship.

While Causation is characterized by a situation in which an action certainly causes an outcome and hence, is described as a cause-and-effect relationship, Correlation on the other hand only establishes a relationship between the two events and doesn't necessarily ascertain the occurrence of the other event .

An example of two variables which may be correlated is; the height and weight of an individual in which case it is generally perceived that taller people are heavier.

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Answer:

this is just a system of equations

x+y=4

2x+3y=12

x=-y+4

plug in

2(-y+4)+3y=12

-2y+8+3y=12

y+8=12

y=4

plug in

x+4=4

x=0

(0,4)

Hope This Helps!!!

Answer:

(0,4)

Step-by-step explanation:

find x by subtracting y from both sides

Answer:

B = 87

Step-by-step explanation:

The Attached Pic includes Sine Law which can be used in any Triangle

So for our Question

we have A=33 , a=6 , b=11

by Applying Sine Law

[tex]\frac{sin(A)}{a} =\frac{sin(B)}{b}[/tex]

Then

[tex]sin(B)=\frac{b*sin(A)}{a} =\frac{11sin(33)}{6}=0.9985\\ B=sin^{-1}( 0.9985)=87[/tex]

Jane goes to the beach if and only if it is a sunny day.

========================================================

Reason:

A regular conditional statement is in the form "If P, then Q" where P and Q are placeholders for other statements.

For example, we can replace "P" with "it rains" and replace "Q" with "the grass gets wet". This means "If P, then Q" becomes "If it rains, then the grass gets wet".

It's hopefully clear that the example above is a one way street. It points in only one direction. The act of raining leads directly to the grass being wet. However, we cannot go in reverse. If we see the grass is wet, it doesn't mean it rained. Perhaps someone turned on a hose or sprinkler system. P leads to Q, but Q does not lead to P.

In short, all of what is mentioned so far is considered a regular conditional statement. So far we haven't addressed bi-conditional statements.

----------------

Bi-conditional statements are conditionals that work in reverse.

An example would be "If a figure is a square, then it has 4 congruent sides and 4 right angles". That conditional statement works in reverse. Therefore "If a figure has 4 congruent sides and 4 right angles, then the figure is a square" is also true simply by what it means to be a square.

So the format "If P, then Q" can be reversed to "If Q, then P" to have an equivalently true statement. The common practice is to use "if and only if" to help shorten things.

We would have the template "P if and only if  Q" which is the same as "Q if and only if P". The order doesn't matter since we can reverse things just fine.

Often you'll find bi-conditional statements when it comes to definitions. The term "weekend" literally means the day is either Saturday or Sunday, which is why choice C is another bi-conditional. A very similar situation applies to choice D as well.

--------------------

We've found that choices A, C and D are bi-conditional statements. They can be ruled out. We're left with choice B.

This is not a bi-conditional. Why not? It's assumed that Jane would go to the beach on a sunny day, but perhaps she enjoys the beach just fine on cloudy days. There's also the fact she could be doing other things on sunny days. The presence of the sun doesn't automatically mean the beach. If you said "It gets warm if and only if it's a sunny day", then I think this is more in line with a bi-conditional.

This is why choice B is the final answer.

Using proportions, it is found that the expression that represents the final price is given as follows:

C(t) = 0.918t.

A proportion is a fraction of a total amount, and the measures are related using a rule of three.

In this problem, we have that:

Thus the expression for the final cost is:

C(t) = t x 0.85 x 1.08 = 0.918t.

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Answer:

10^6

Step-by-step explanation:

exponents show how many times a number multiplies by itself

in this case, 10 multiplies by itself 6 times, so the answer should be 10^6