Determine which families of grid curves have u constant and which have v constant. - the grid curves lies in the vertical plane y = (tan^3 u)x - each grid curve is a circle of radius lul in the horizontal plane z = sin u - each grid curve is a circle of radius (1 – |u|) in the horizontal plane z = u - each grid curve is a helix - each grid curve lies in a plane z = ky that includes the x-axis - each grid curve is a vertically oriented circle v constant - the grid curves lie in vertical planes y = kx through the z-axis - a straight line in the plane z = v which intersects the z-axis - each grid curve is a circle contained in the vertical plane x = sin v parallel to the yz-plane
- the grid curves run vertically along the surface in the planes y = kx
- the grid curves are the spiral curves
- the grid curves lies in a horizontal plane = x

The critical point of f is x = -3,f is increasing on the open interval (-∞, -3) and decreasing on the open interval (-3, ∞) and there is a local maximum at x = -3.

a. To find the critical points of f, we need to solve for when f'(x) = 0 or when the derivative does not exist.

f'(x) = (x + 3) e ^− 2x = 0 when x = -3 (since [tex]e^{\minus2x}[/tex] is never zero)

To check for when the derivative does not exist, we need to check the endpoints of any open intervals where f is defined. However, since f is defined for all real numbers, there are no endpoints to check.

Therefore, the critical point of f is x = -3.

b. To determine where f is increasing or decreasing, we need to examine the sign of f'(x).

f'(x) > 0 when (x + 3) e ^− 2x > 0

e ^− 2x is always positive, so we just need to consider the sign of (x + 3).

(x + 3) > 0 when x > -3 and (x + 3) < 0 when x < -3.

Therefore, f is increasing on the open interval (-∞, -3) and decreasing on the open interval (-3, ∞).

c. To find local maximum and minimum values of f, we need to look for critical points and points where the derivative changes sign.

We already found the critical point at x = -3.

f'(x) changes sign at x = -3 since it goes from positive to negative. Therefore, there is a local maximum at x = -3.

There are no other critical points or sign changes, so there are no other local maximum or minimum values.

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Answer:

Point-circle

Step-by-step explanation:

The equation x^2 + y^2 = 0 represents a point circle.

To see why, note that any point (x, y) that satisfies this equation must have x^2 = 0 and y^2 = 0, since the sum of two non-negative numbers is zero only when both are zero. This implies that x = 0 and y = 0, so the only point that satisfies the equation is the origin (0, 0).

Therefore, the equation x^2 + y^2 = 0 represents a circle with radius zero, which is a point circle at the origin. The appropriate description for the equation is a point circle.

The confidence interval is given by: [F(b) - F(a)] - z_alpha/2 * sqrt{ [F(b)(1 - F(b)) + F(a)(1 - F(a)) - 2F(a)F(b) + 2F(a)^2] / n } <= theta <= [F(b) - F(a)] + z_alpha/2 * sqrt{ [F(b)(1 - F(b)) + F(a)(1 - F(a)) - 2F(a)F(b) + 2F(a)^2] / n }

The estimated standard error of theta can be found using the following formula:

SE(theta) = sqrt{ [F(b)(1 - F(b)) / n] + [F(a)(1 - F(a)) / n] }

where n is the sample size.

To find an approximate 1 - alpha confidence interval for theta, we first need to find the standard error of the estimator. Let X1, X2, ..., Xn be the random sample. Then, the estimator T(Fn) is given by:

T(Fn) = Fn(b) - Fn(a)

The variance of T(Fn) can be estimated as:

Var(T(Fn)) = Var(Fn(b) - Fn(a)) = Var(Fn(b)) + Var(Fn(a)) - 2Cov(Fn(b), Fn(a))

Using the fact that Fn is a step function with jumps of size 1/n at each observation, we can calculate the variances and covariance as:

Var(Fn(x)) = Fn(x)(1 - Fn(x)) / n

Cov(Fn(b), Fn(a)) = - Fn(a)(F(b) - F(a)) / n

Substituting these into the expression for Var(T(Fn)), we get:

Var(T(Fn)) = [F(b)(1 - F(b)) + F(a)(1 - F(a)) - 2F(a)(F(b) - F(a))] / n

Simplifying this expression, we get:

Var(T(Fn)) = [F(b)(1 - F(b)) + F(a)(1 - F(a)) - 2F(a)F(b) + 2F(a)^2] / n

Now, the standard error of T(Fn) can be calculated as the square root of the variance:

SE(T(Fn)) = sqrt{ [F(b)(1 - F(b)) + F(a)(1 - F(a)) - 2F(a)F(b) + 2F(a)^2] / n }

To construct an approximate 1 - alpha confidence interval for theta, we use the following formula:

T(Fn) +/- z_alpha/2 * SE(T(Fn))

where z_alpha/2 is the (1 - alpha/2)th quantile of the standard normal distribution. Therefore, the confidence interval is given by:

[F(b) - F(a)] - z_alpha/2 * sqrt{ [F(b)(1 - F(b)) + F(a)(1 - F(a)) - 2F(a)F(b) + 2F(a)^2] / n } <= theta <= [F(b) - F(a)] + z_alpha/2 * sqrt{ [F(b)(1 - F(b)) + F(a)(1 - F(a)) - 2F(a)F(b) + 2F(a)^2] / n }

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The value of t such that the area under the curve between −|t| and |t| equals 0.95, assuming 12 degrees of freedom, is approximately 1.782.

Using a t-distribution table or statistical software, we can find the t-value that corresponds to an area of 0.95 in the upper tail of the t-distribution with 12 degrees of freedom. From the t-distribution table, we find that the t-value with 0.95 area in the upper tail and 12 degrees of freedom is approximately 1.782.

Therefore, the value of t such that the area under the curve between −|t| and |t| equals 0.95, assuming 12 degrees of freedom, is approximately 1.782.

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Inequality comparing 13 is;

13/4-1/13¹/² >= 13/2

We need to show that 13/4-1/13¹/²ˣ² is greater than or equal to 13/2.

First, let's simplify 13/4-1/13¹/² by finding a common denominator:

13/4 - 1/13¹/² = 13/4 - 113¹/²/13 = (1313¹/² - 4)/13¹/²²) = (13¹/²)^2/13¹/²² - 4/13¹/²ˣ²

Simplifying further, we get:

13/4 - 1/13¹/² = (13/13) - 4/13¹/²ˣ²) = 13/13 - 4/169 = 159/169

So, we need to show that 159/169 is greater than or equal to 13/2:

159/169 >= 13/2

Multiplying both sides by 169/2, we get:

159*169/338 >= 169/2 * 13/2

Simplifying, we get:

159/2 >= 169/4

Which is true, so we can conclude that:

13/4-1/13¹/² >= 13/2

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The probability of pulling 2 green marbles from the bag is 3/29

From the question, there are a total of 30 marbles in the bag.

The probability of pulling a green marble on the first draw is 10/30.

After removing one green marble, there are now 9 green marbles left in the bag out of a total of 29 marbles.

The probability of pulling another green marble on the second draw is 9/29.

Therefore, the probability of pulling 2 green marbles from the bag is (10/30) * (9/29) = 3/29

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Answer:

C. x-intercept = (-6, 0)

y-intercept = (0, -48/5)

Step-by-step explanation:

as you can see, x-intercept means y = 0.

and y-intercept means x = 0.

so, for x = 0 we have

5y = -48

y = -48/5

for y = 0 we have

8x = -48

x = -48/8 = -6

The critical numbers of the function f(θ) = 2cos(θ) + sin^2(θ) on the interval 0 ≤ θ < 2π are:
θ = 0 (smaller value)
θ = π (larger value)

To find the critical numbers of the function f(θ) = 2cos(θ) + sin^2(θ) on the interval 0 ≤ θ < 2π, follow these steps:

1. Find the derivative of f(θ) with respect to θ. This will give us f'(θ).
f'(θ) = -2sin(θ) + 2sin(θ)cos(θ)

2. Set f'(θ) to 0 and solve for θ. This will give us the critical numbers.
0 = -2sin(θ) + 2sin(θ)cos(θ)

Factor out the common term 2sin(θ):
0 = 2sin(θ)(1 - cos(θ))

Now, set each factor to 0:
2sin(θ) = 0
1 - cos(θ) = 0

Solve for θ:
sin(θ) = 0
cos(θ) = 1

3. Determine θ values within the given interval (0 ≤ θ < 2π):
For sin(θ) = 0, θ = 0, π
For cos(θ) = 1, θ = 0

4. Identify the smallest and largest critical numbers.
θ = 0 (smallest value)
θ = π (largest value)

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[tex]\underset{ \textit{angle in degrees} }{\textit{area of a regular polygon}}\\\\ A=na^2\cdot \tan\left( \frac{180}{n} \right) ~~ \begin{cases} n=sides\\ a=apothem\\[-0.5em] \hrulefill\\ n=8\\ a=15 \end{cases}\implies A=(8)(15)^2\tan\left( \frac{180}{8} \right) \\\\\\ A=1800\tan(22.5^o)\implies A\approx 745.6[/tex]

Make sure your calculator is in Degree mode.

The sampling distribution for x Overbar Subscript Upper A Baseline minus x Overbar Subscript Upper C is 0.13.

The standard deviation of the sampling distribution for the difference in sample means can be calculated using the formula:

Standard deviation of the sampling distribution = √[(σ[tex]A^2[/tex]/nA) + (σ[tex]C^2[/tex]/nC)]

Where nA and nC are the sample sizes for Alex and Chris, respectively, and A and C are the standard deviations of the population for Alex and Chris, respectively.

Substituting the given values, we get:

Standard deviation of the sampling distribution = [tex]\sqrt{[(0.38^2/10) + (0.2^2/15)]}[/tex]

= [tex]\sqrt{0.01444 + 0.00222}[/tex]

= [tex]\sqrt{0.01666}[/tex]

= 0.129

Therefore, the answer is 0.13.

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The number of subjects in a repeated-measures and an independent-measures study, both produced a t statistic with df = 15.

For a repeated-measures study, the degrees of freedom (df) is calculated as N - 1, where N is the number of subjects. Therefore, in this case:
15 = N - 1
N = 15 + 1
N = 16
So, there were 16 subjects in the repeated-measures study.

For an independent-measures study, the degrees of freedom (df) are calculated as (N1 - 1) + (N2 - 1), where N1 and N2 are the number of subjects in each group. Since we know df = 15:
15 = (N1 - 1) + (N2 - 1)
As we don't have information about the specific group sizes, we can assume equal sizes for simplicity, which gives us:
15 = (N - 1) + (N - 1)
15 = 2N - 2
N = (15 + 2) / 2
N = 17 / 2
N = 8.5
Since there are two groups, the total number of subjects in the independent-measures study is 8.5 * 2 = 17.

To summarize, in the repeated-measures study, there were 16 subjects, and in the independent-measures study, there were 17 subjects.

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The answer are :

x = 5

y = 20

z = 17.3

Sorry for bad handwriting

if i was helpful Brainliests my answer ^_^

el aumento en el salario mensual base de Verónica será de 1,650.00.

para ayudar a Verónica a determinar cuánto dinero le van a aumentar en su salario mensual base con un aumento del

15%, debemos seguir estos pasos:

Identificar el salario mensual base de Verónica, que es de 11,000.00.

Identificar el porcentaje de aumento, que es del 15%.

Convertir el porcentaje de aumento a decimal dividiendo por 100 (15 ÷ 100 = 0.15).

Multiplicar el salario mensual base por el porcentaje de aumento en decimal (11,000.00 × 0.15 = 1,650.00).

Por lo tanto, el aumento en el salario mensual base de Verónica será de 1,650.00.

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Both confidence interval estimation and hypothesis testing are important tools in statistical inference, and they are often used together to gain a better understanding of a population based on a sample of data.

True.

Statistical inference is the process of making conclusions about a population based on a sample of data. There are two main types of statistical inference: confidence interval estimation and hypothesis testing.

Confidence Interval Estimation: A confidence interval is a range of values that is likely to contain the true value of a population parameter with a certain degree of confidence. For example, we might want to estimate the mean weight of all male college students in the United States. We could take a random sample of male college students and calculate the sample mean weight. We could then construct a confidence interval for the population mean weight, such as "we are 95% confident that the true population mean weight of male college students in the United States falls between X and Y pounds." The level of confidence chosen (in this case, 95%) determines the width of the interval.

Hypothesis Testing: Hypothesis testing is the process of using sample data to test a hypothesis about a population parameter. For example, we might want to test the hypothesis that the mean weight of all male college students in the United States is equal to 160 pounds. We could take a random sample of male college students and calculate the sample mean weight. We could then use statistical tests to determine whether the sample mean is significantly different from 160 pounds. We would do this by calculating a test statistic (such as a t-statistic) and comparing it to a critical value based on the chosen level of significance (such as 0.05). If the test statistic falls in the rejection region (where it is unlikely to have occurred by chance alone), we would reject the null hypothesis and conclude that the population mean weight is not 160 pounds. If the test statistic does not fall in the rejection region, we would fail to reject the null hypothesis and conclude that there is not enough evidence to conclude that the population mean weight is different from 160 pounds.

Both confidence interval estimation and hypothesis testing are important tools in statistical inference, and they are often used together to gain a better understanding of a population based on a sample of data.

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The change of the coordinate matrix is P = | -1  5 |  |  4 -3 | from B to L.

And the  [x]L for x=5b1+3b2 is   |-10| | 11 |

B={b1, b2} and L={c1, c2} are bases for a vector space V. We know that b1=-c1+4c2 and b2=5c1-3c2. We want to find the change of the coordinate matrix from B to L and find [x]L for x=5b1+3b2.

a.  the change of the coordinate matrix from B to L, we need to express each b vector in terms of the L basis. We are given that b1=-c1+4c2 and b2=5c1-3c2. Write these as a column matrix:

P = | -1  5 |
      |  4 -3 |

This matrix P is the change of the coordinate matrix from B to L.

b. To find [x]L for x=5b1+3b2, we first express x in terms of B:

x = 5b1 + 3b2

Now, we want to find the coordinates of x in the L basis. To do this, we multiply the given x's B-coordinates with the change of coordinate matrix P:
[x]L = P[x]B

[x]L = | -1  5 | | 5 |
           |  4 -3 | | 3 |

[x]L = |-10| | 11 |

So, the coordinates of x in the L basis are [x]L = (-10, 11).

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The solution for the given expression is given below:

a. vertical asymptote. b. the graph of f will pass through the point (0, 15). c. to keep f(x) within 0.01 units of 7, we need to keep x between 2.9986 and 3.0014.

What is expression?

In general, an expression is a combination of symbols, numbers, and/or operators that can be evaluated to produce a value. In programming, an expression typically refers to a sequence of one or more operands and operators that can be evaluated to produce a single value.

a. When x = 3, the denominator of f(x) becomes zero, and therefore f(3) is undefined (or does not exist). This is called a vertical asymptote.

b. To plot the graph of f, we can factor the numerator as follows:

f(x) = (4x-3)(x-5)/(x-3)

The graph of f will have a vertical asymptote at x = 3, and the function will be undefined at that point. The factor (4x-3)(x-5) has zeros at x = 3/4 and x = 5, so the graph will cross the x-axis at those points. We can also find the y-intercept by setting x = 0:

f(0) = (4(0)-3)(0-5)/(0-3) = 15

Therefore, the graph of f will pass through the point (0, 15).

c. The limit of f(x) as x approaches 3 is given by:

lim[x→3] f(x) = lim[x→3] (4[tex]x^2[/tex]-17x+15)/(x-3) = 7

To find how close to 3 we need to keep x in order for f(x) to be within 0.01 units of 7, we can use the definition of a limit:

|f(x) - 7| < 0.01

This inequality can be rewritten as:

-0.01 < f(x) - 7 < 0.01

[tex]-0.01 < (4x^2-17x+15)/(x-3) - 7 < 0.01[/tex]

Solving for x using this inequality is difficult, but we can use a graphing calculator or a numerical method to find the values of x that satisfy it. For example, using a graphing calculator, we can graph the function (4x^2-17x+15)/(x-3) and the horizontal lines y = 7.01 and y = 6.99, and find the values of x where the graph intersects those lines. We get:

x ≈ 3.0014 and x ≈ 2.9986

Therefore, to keep f(x) within 0.01 units of 7, we need to keep x between 2.9986 and 3.0014.

Similarly, to find how close to 3 we need to keep x in order for f(x) to be within 0.0001 units of 7, we can use the inequality:

|f(x) - 7| < 0.0001

This inequality can be rewritten as:

-0.0001 < f(x) - 7 < 0.0001

[tex]-0.0001 < (4x^2-17x+15)/(x-3) - 7 < 0.0001[/tex]

Using a similar method as before, we can find that we need to keep x between approximately 2.99994 and 3.00006 to keep f(x) within 0.0001 units of 7.

To keep f(x) arbitrarily close to 7 just by keeping x close to 3 but not equal to 3, we can use the fact that the function approaches 7 as x approaches 3 from both sides. This means that we can make f(x) as close to 7 as we want by choosing a small enough positive or negative deviation from 3.

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For 4 decimal places (0.0001), the minimal degree Taylor polynomial is of degree 9. For 7 decimal places (0.0000001), the minimal degree Taylor polynomial is of degree 13

To calculate sin(1) to 4 decimal places, we need to find the minimal degree Taylor polynomial about x=0. The Taylor series for sin(x) is:

sin(x) = x - (x^3/3!) + (x^5/5!) - (x^7/7!) + ...

To find the minimal degree polynomial that gives sin(1) to 4 decimal places, we need to find the first few terms of the series that contribute to the first 4 decimal places of sin(1).

If we evaluate sin(1) using the first two terms of the series, we get:

sin(1) ≈ 1 - (1^3/3!) = 0.83333

This is accurate to only one decimal place. If we evaluate sin(1) using the first three terms of the series, we get:

sin(1) ≈ 1 - (1^3/3!) + (1^5/5!) = 0.84147

This is accurate to 4 decimal places. Therefore, the minimal degree Taylor polynomial about x=0 that we need to calculate sin(1) to 4 decimal places is degree 3.

To calculate sin(1) to 7 decimal places, we need to find the first few terms of the series that contribute to the first 7 decimal places of sin(1). If we evaluate sin(1) using the first four terms of the series, we get:

sin(1) ≈ 1 - (1^3/3!) + (1^5/5!) - (1^7/7!) = 0.8414710

This is accurate to 7 decimal places.

Therefore, the minimal degree Taylor polynomial about x=0 that we need to calculate sin(1) to 7 decimal places is degree 4.

To approximate sin(1) using a Taylor polynomial with x = 0, you'll need to determine the minimal degree required to achieve the desired accuracy.

For 4 decimal places (0.0001), the minimal degree Taylor polynomial is of degree 9. This is because the Taylor series for sin(x) contains only odd degree terms, and using a 9th-degree polynomial will give you the required precision.

For 7 decimal places (0.0000001), the minimal degree Taylor polynomial is of degree 13. Similarly, this is because the Taylor series for sin(x) contains only odd degree terms, and using a 13th-degree polynomial will give you the required precision.

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The lines can divide the plane such that :

General position means that no two lines are parallel and no three lines intersect at a single point. When lines are in general position, we can count the number of bounded and unbounded regions they divide the plane.

The plane is divided into 2 unbounded and 0 bounded sections by 1 line. The plane is divided into 1 bounded and 4 unbounded sections by 2 lines. The plane is divided into 4 bounded and 6 unbounded sections by 3 lines. The plane is divided into 11 bounded and 8 unbounded sections by 4 lines.

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If a student is selected at random from this senior class,  the probability that the student is:  

(i) a male and has a driver's license is 0.3825,

(ii) a female and has a driver's license is 0.385.

We need to find the probability that a student is (i) a male and has a driver's license, and (ii) a female and has a driver's license, given that there are 400 seniors, 180 of which are males.

(i) A male and has a driver's license:
Step 1: Find the number of males with driver's licenses: 180 males * 85% = 153 males.
Step 2: Calculate the probability: (Number of males with driver's licenses) / (Total number of seniors) = 153/400.
Step 3: Simplify the probability: 153/400 = 0.3825.

(ii) A female and has a driver's license:
Step 1: Calculate the number of females: 400 seniors - 180 males = 220 females.
Step 2: Find the number of females with driver's licenses: 220 females * 70% = 154 females.
Step 3: Calculate the probability: (Number of females with driver's licenses) / (Total number of seniors) = 154/400.
Step 4: Simplify the probability: 154/400 = 0.385.

So, the probability that a student selected at random from this senior class is: (i) a male and has a driver's license is 0.3825, and (ii) a female and has a driver's license is 0.385.

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If a student is selected at random from this senior class,  the probability that the student is:  

(i) a male and has a driver's license is 0.3825,

(ii) a female and has a driver's license is 0.385.

We need to find the probability that a student is (i) a male and has a driver's license, and (ii) a female and has a driver's license, given that there are 400 seniors, 180 of which are males.

(i) A male and has a driver's license:
Step 1: Find the number of males with driver's licenses: 180 males * 85% = 153 males.
Step 2: Calculate the probability: (Number of males with driver's licenses) / (Total number of seniors) = 153/400.
Step 3: Simplify the probability: 153/400 = 0.3825.

(ii) A female and has a driver's license:
Step 1: Calculate the number of females: 400 seniors - 180 males = 220 females.
Step 2: Find the number of females with driver's licenses: 220 females * 70% = 154 females.
Step 3: Calculate the probability: (Number of females with driver's licenses) / (Total number of seniors) = 154/400.
Step 4: Simplify the probability: 154/400 = 0.385.

So, the probability that a student selected at random from this senior class is: (i) a male and has a driver's license is 0.3825, and (ii) a female and has a driver's license is 0.385.

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The answer of the given question based on the hexagon is  the height of the hexagon is equal to the apothem, which is approximately 14.02 inches.

An apothem is  line segment that connects  center of  regular polygon to  midpoint of one of its sides. In other words, it is the distance from the center of a regular polygon to the midpoint of one of its sides.

We can start by using the formula for the area of a hexagon, which is:

Area = (3/2) × (length of a side) × (apothem)

where the apothem is the distance from the center of the hexagon to the midpoint of a side, and the length of a side can be calculated using the given base and height.

First, we can calculate the length of a side using the given base and height:

Using the Pythagorean theorem, we can find the length of the side opposite the height:

(side)² = (base/2)² + (height)²

(side)² = (27/2)² + (12)²

(side)² = 729/4 + 144

(side)² = 1269/4

side ≈ 17.87 inches

Next, we can use the formula for the area of a hexagon to find the apothem:

Area = (3/2) × side × apothem

396 = (3/2) × 17.87 × apothem

apothem ≈ 14.02 inches

Therefore, the height of the hexagon is equal to the apothem, which is approximately 14.02 inches.

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The data set that shows greater variability is Data set B.

Mean Absolute Deviation, abbreviated as M.A.D, quantifies the variability in a dataset by measuring how much its data points deviate from their mean.

This deviation delivers an accurate measure of spread, based on which one can determine if the information is clustered or dispersed relative to the mean. Supposing M.A.D yields a small value, it reflects that data points are closely grouped around the average, implying there is low dispersion; conversely, large values signify widespread distribution from the mean indicating high variation among data points.

Data set B has a larger variability as a result, because it has a larger value of MAD.

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Answer:

4/(x-2)

Step-by-step explanation:

(x²+2x-4)/(x-2)

x + 4/(x-2)

4/(x-2)

The answers to the trigonometric prompts are:

1)

1.1) -0.15

1.2) 0.87

2)

2.1) x = 60°

2.2) x = 70.54°

3) k = 1

1.1 To calculate the value of Tan^2 (316.4 degrees - 212.6 degrees), we first need to find the difference between the two angles:

316.4 degrees - 212.6 degrees = 103.8 degrees

Then, we can use the identity Tan^2 (A - B) = [Tan(A) - Tan(B)]/[1 + Tan(A) Tan(B)] to get:

Tan^2 (316.4 degrees - 212.6 degrees) = [Tan(316.4 degrees) - Tan(212.6 degrees)]/[1 + Tan(316.4 degrees) Tan(212.6 degrees)]

Using a calculator, we get:

Tan(316.4 degrees) ≈ -1.378

Tan(212.6 degrees) ≈ 1.378

So, substituting these values into the above equation, we get:

Tan^2 (316.4 degrees - 212.6 degrees) ≈ [(-1.378) - 1.378]/[1 + (-1.378)(1.378)] ≈ -0.19

Therefore, Tan^2 (316.4 degrees - 212.6 degrees) ≈ -0.19

1.2 To calculate the value of 2Sin(2x 103.4 degrees), we can use the double angle formula for sine:

2Sin(2x 103.4 degrees) = 2(2Sin(103.4 degrees)Cos(103.4 degrees))

Using a calculator, we get:

Sin(103.4 degrees) ≈ 0.974

Cos(103.4 degrees) ≈ -0.226

Substituting these values into the above equation, we get:

2Sin(2x 103.4 degrees) ≈ 2(2(0.974)(-0.226)) ≈ -0.88

Therefore, 2Sin(2x 103.4 degrees) ≈ -0.88

2.1 To solve the equation 2cos(x) = 1, we can first isolate cos(x) by dividing both sides by 2:

cos(x) = 1/2

To find the solutions in the given interval [0 degrees; 90 degrees], we can use the inverse cosine function (cos^-1) and find the principal value:

cos^-1(1/2) ≈ 60 degrees

Therefore, the solution to the equation 2cos(x) = 1 in the interval [0 degrees; 90 degrees] is x = 60 degrees.

To find the value of k in the equation k.sin 60 degrees = (2 cos 30 degrees)/tan 45 degrees, we can use the values of sin 60 degrees, cos 30 degrees, and tan 45 degrees:

sin 60 degrees = √3/2

cos 30 degrees = √3/2

tan 45 degrees = 1

Substituting these values into the given equation, we get:

k(√3/2) = (2 √3/2)/1

Simplifying, we get:

k = 2

Therefore, the value of k is 2.

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Each side of the square room is 9 feet long.

A square is a two-dimensional geometric shape with four equal sides and four equal angles of 90 degrees each. It is a type of rectangle, but it has the additional property that all its sides are of equal length.

Since the room is square and the floor tiles are also square, the number of tiles required to cover the floor is equal to the area of the room divided by the area of each tile.

Let's assume that each side of the square room is "x" feet long. Then, the area of the room can be expressed as x² square feet. If each floor tile measures "y" feet on each side, then the area of each tile can be expressed as y² square feet.

Given that 81 tiles are required to cover the floor, we can set up the following equation:

x² / y² = 81

To solve for "x", we need to first determine the value of "y". Since each floor tile is a square, we can assume that y is the length of one side of a tile. Let's suppose that each tile measures 1 foot on each side. Then, the area of each tile is y² = 1² = 1 square foot.

Substituting y = 1 in the above equation, we get:

x² / 1² = 81

x² = 81

x = √(81)

x = 9

Therefore, each side of the square room is 9 feet long.

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The graph of the parabola (x- 5 )²/25 - (y + 3)²/36 = 1 is added as an attachment

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

(X-5)2/25 - (y+3)2/36 = 1.

Express the equation properly

So, we have

(x- 5 )²/25 - (y + 3)²/36 = 1

The above expression is a an equation of a conic section

Next, we plot the graph using a graphing tool

To plot the graph, we enter the equation in a graphing tool and attach the display

See attachment for the graph of the function

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When considering limits for functions of several variables, it is not sufficient to say that the limit exists if it approaches the same value along the x-axis and y-axis.

Value of the function may depend on the path taken to approach the limit point, and different paths may give different limit values.

For example, consider the function f(x,y) = xy/(x² + y²). If we approach the point (0,0) along the x-axis (y=0), we get f(x,0) = 0 for all x, so it seems like the limit should be 0.

Similarly, if we approach along the y-axis (x=0), we get f(0,y) = 0 for all y, so again it seems like the limit should be 0. However, if we approach along the path y=x, we get f(x,x) = 1/2 for all x≠0, so the limit does not exist.

This illustrates the concept of path dependence in limits for functions of several variables.

To determine if a limit exists, we must consider all possible paths to the limit point and show that they all approach the same value. If the limit is the same regardless of the path taken, we say that the limit is path-independent. Otherwise, the limit does not exist.

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Step-by-step explanation:

One out of six chance of rolling a '2'    = 1/6

one out of two chance of landing on tails    = 1/2

1/6 * 1/2 = 1/12