what percent of the students who spend less than 4 hours a week on screens reported a grade average above 80? round your answer to the nearest tenth of a percent

Answer:

2875

Step-by-step explanation:

The first-order partial derivatives of w with respect to x, y, and z are:

∂w/∂x = 8[(y^2+z^2 - 7x^2)/(x^2+y^2+z^2)^(9/2)]

∂w/∂y = -56xy / (x^2+y^2+z^2)^(9/2)

∂w/∂z = -56xz / (x^2+y^2+z^2)^(9/2)

To compute the first-order partial derivatives of the function w = 8x / (x^2+y^2+z^2)^(7/2), we need to take the partial derivatives with respect to each variable x, y, and z, while treating the other variables as constants. We can use the quotient rule and chain rule to do this:

∂w/∂x = (8(x^2+y^2+z^2)^(7/2) - 8x(7/2)(2x)) / (x^2+y^2+z^2)^(7/2))^2

= 8[(y^2+z^2 - 7x^2)/(x^2+y^2+z^2)^(9/2)]

∂w/∂y = (8x(-7/2)(2y)(x^2+y^2+z^2)^(5/2) / (x^2+y^2+z^2)^7/2)

= -56xy / (x^2+y^2+z^2)^(9/2)

∂w/∂z = (8x(-7/2)(2z)(x^2+y^2+z^2)^(5/2) / (x^2+y^2+z^2)^7/2)

= -56xz / (x^2+y^2+z^2)^(9/2)

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The given question is incomplete, the complete question is:

Compute the first‑order partial derivatives of the function. w = 8x / (x^2+y^2+z^2)^(7/2)  (use symbolic notation and fractions where needed.)

The expression which is to be subtracted as calculated from the data given is found out to be as , 0.22.

The coordinates of the parallelogram as mentioned in the question is , R(-4, -3), S(-5, 1), T(4, 3), U(5, -1)

Therefore, the length of the sides as measured using distance formula is found out to be as,

RS = 4.1231, RT = 10 , ST = 9.2195 , SU = 10.198 ,TU = 4.1231 and  UR = 9.2195.

Now as we know that 2 sides of a parallelogram are parallel , therefore,

RS || TU and ST || UR.

RS(slope) = (1 - (-3))/(-5 - (-4)) = -4

and the ,

ST(slope)= (3 - 1)/(4 - (-5)) = 2/9

Hence , to find the line perpendicular to ST is given by ,

y - 1 = -9/2×(x - (-5))

y = -9x/2 - 43/2

The equation of RS = y - (-3) = 1/4×(x - (-4)) = x/4 + 1

y = x/4 - 2

Their point of interaction is , -9x/2 - 43/2  =  x/4 - 2

x = -78/19

y = -115/38

Side of rectangle  = 4.1245

width of the rectangle = 0.1085

Therefore, the expression can be subtracted from the area of the rectangle to find the area of parallelogram RSTU = 1/2 × 4.1245 × 0.1085

= 0.22.

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Answer:

-6

Step-by-step explanation:

Answer:Formular for simple interest is

I = P X R XT

————

100

where P is the amount borrowed or loan , Rate is the percentage of interest in P while T is the Time range for the loan

Now to find the Principal, we now change the original subject of the formula to suit or reflect P.
P = I X 100

———-

R X T

= 11, 178

———

6 X 9

=. 11, 178

——

54

=. $20,700

Step-by-step explanation:

Answer:

$20,700

Step-by-step explanation:

Simple Interest Formula

I = Prt

where:

Given:

Substitute the given values into the formula and solve for P:

\(\implies \sf 11178=P(0.06)(9)\)

\(\implies \sf 11178=0.54P\)

\(\implies \sf P=\dfrac{11178}{0.54}\)

\(\implies \sf P=20700\)

Therefore, the principal amount is $20,700.

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The point F lies on 4.5 in the number line.

What is the number line?

The number line is a One dimensional representation of point referring by a number only.

We know that if a point divides a line joining the points at x, y in the number line respectively in m:n ratio then that point lies on

= (my+nx)/(m+n) in the number line.

Here in the given problem that,

Point D lies on -6 in the number lin

Point E lies on 8 in the number line

And F lies between D and E points and DE:EF = 3:1

So the point F clearly divides the staright line DE joining the point D at -6 and E at 8 in 3:1 ratio.

So the point F lies on = (1*(-6)+3*8)/(3+1) = (-6+24)/4 = 18/4 = 4.5

Hence, the point F lies on 4.5 in the number line.

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Answer:

Hi, I belive your answer is 188.02

sorry if it is wrong

Here is how to get the answer which is 188.02; 11.9 x 15.8= 188.02in²

and here you go have a splendid day!

Step-by-step explanation:

Answer:

188.02

Step-by-step explanation:

Answer:

Left box:  1/2n

Right box = 2n - 22

Step-by-step explanation:

Since we want one-half the number and n represents the unknown number, we have 1/2n on the left-hand side of the equation.

Thus, you want to put 1/2n in box on the left.

Twice the number and 22 less than this is given by:  y: 2n - 22 less than this means we subtract.  Thus, we have 2n - 22 as the numerator on the right hand side of the equation.

Thus, you want to put 2n - 22 in the box on the right.

Answer:

y = 5x

Step-by-step explanation:

y = kx

65 = k (13)

65/13 = k

k = 5

~~~~~~~~~~~~

y = 5x

Answer:

The answer is C 212

Answer:

Step-by-step explanation:

Answer

19 mi

Step-by-step explanation:

If the mean age of the employees at a large corporation is 35.2 years, and the standard deviation is 9.5 years. The mean and standard deviation of the sampling distribution of the sample mean for samples of size 4  is: The mean is 35.2, and the standard deviation is 9.5/2.

The mean of the sampling distribution of the sample mean  is equal to the population mean (n35.2 years).

The standard deviation of the sampling distribution of the sample mean  is equal to the population standard deviation (9.5 years) divided by the square root of the sample size (4), which is:
9.5 / √(4)

= 9.5 / 2

= 4.75

Therefore  the mean of the sampling distribution of the sample mean is 35.2 and  standard deviation is 9.5/2.

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Answer:

-1

Step-by-step explanation:

(-1) ^3

This is (-1) multiplied together 3 times

(-1) * (-1) * (-1)

-1

When estimating a population mean, you are more likely to be correct when using an interval estimate rather than a point estimate. An interval estimate provides a range of values within which the true population mean is likely to fall, accounting for uncertainty. This range provides a higher level of confidence compared to a single point estimate.

When estimating a population mean, you are more likely to be correct when using an interval estimate rather than a point estimate. The reason is that an interval estimate provides a range of values within which the population mean is likely to fall, taking into account the inherent uncertainty in the estimation process.

A point estimate, on the other hand, provides a single value as an estimate of the population mean, without accounting for the variability or margin of error. While a point estimate may be close to the true population mean, there is no measure of confidence or precision associated with it.

An interval estimate, such as a confidence interval, incorporates both a point estimate and a margin of error, which quantifies the uncertainty in the estimate. By providing a range of values, the interval estimate acknowledges that the true population mean may fall within that range with a certain level of confidence.

Using an interval estimate allows for a more comprehensive understanding of the population mean and provides a measure of the reliability of the estimate. It acknowledges the inherent variability in sampling and estimation processes, ultimately increasing the likelihood of being correct in estimating the population mean.

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A. The y-intercept is at the point (0, 0).

B.  The zeros are x = 0 or x = ±√5

C.

A) The y-intercept of this graph is the point where x = 0.

When  x = 0, the value of y

= 0^4 - 5*0^2

= 0.

Therefore, the y-intercept is at the point (0, 0).

B) The x-intercepts/roots of the function are the values of x that make y = 0.

To find these values, we need to set y = 0 and solve for x:

x⁴ - 5x² = 0

x⁴ = 5x²

x² = x⁴/5

x = ±√(x⁴/5)

We can simplify this expression by factoring x² out of both sides:

x²(x² - 5) = 0

x² = 0 or x² - 5 = 0

x = 0 or x = ±√5

hence the x-intercepts are at x = 0 and x = ±√5.

C) The end behavior of this function refers to how the graph of the function approaches the x-axis as x approaches positive infinity and negative infinity.

x → ∞ f(x) → ∞

x → -∞ f(x) → -∞

D) The graph is attached

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Answer:

A

Step-by-step explanation:

calculate 20% of $88

\(\frac{20}{100}\) × $88 = 0.2 × $88 = $17.60

Answer:

Sure, here are the numbers arranged from greatest to least

Step-by-step explanation:

Order from greatest to least

1.3, 4.5%, 1/3, -4/5, -0.04, -21.5%

Answer:

From the greatest to least

Step-by-step explanation:

1.3, 4.5%, 1/3, -4/5, -0.04, -21.5%

You can identify which number is greater than other by using a number line.

What is a number line?

A number line is what a math student can use to find the answer to addition and subtraction questions. A straight line, theoretically extending to infinity in both positive and negative directions from zero, that shows the relative order of the real numbers.

Hope this helps :)

Pls Brainliest...

Answer:

Diagram a : y = 7, x = 8

Diagram b : y = 16, x = 6

Diagram c : y = 7, x = 5

Step-by-step explanation:

Diagram a :

calculate y:                              calculate x:

4y - 6 = 22                                  2x + 3 = 19

      +6     +6                                       -3      -3

4y = 28                                          2x = 16

/4      /4                                           /2      /2

y = 7                                                x = 8

Diagram b :

calculate y :                               calculate x :

3 (y-4) = 36                                   5 (x +2 ) = 40

3y - 12 = 36                                  5x +10 = 40

     +12    +12                                       -10    -10

3y = 48                                          5x = 30

/3      /3                                           /5       /5

y = 16                                             x = 6

Diagram c :

calculate y:                                  calculate x :

2y + 9 = 4y - 5                              4x + 2 = 3x + 7

-2y          -2y                                 -3x          -3x

9 = 2y - 5                                       x + 2 = 7

+5         +5                                           -2    -2

14 = 2y                                            x = 5

/2     /2

y = 7

Answer:

39/10

Step-by-step explanation:

Answer:

39/10

Step-by-step explanation:

happy to help u:)

Answer:

Step-by-step explanation:

C the probability that a customer buys a hat given that the customer has bought a sweater.

Answer:

Dilation with a scale factor of 2

Answer:

* Dilation with a scale factor of 2

Step-by-step explanation:

B is my answer

Answer:

0.028x-6-0.48x-2+0.552x

(0.028-0.48+0.552)x-6-2

0.1x-8

The simplified expression, when evaluated for x=36, is -4.4, when following expression and evaluate for x=36 b= 0.02(1.4x - 300)-0.2(2.4x+10)+0.552x

To simplify the expression and evaluate it for x=36, let's break it down step by step:

0.02(1.4x - 300) - 0.2(2.4x + 10) + 0.552x

First, let's simplify the terms within each set of parentheses:

0.02 * (1.4 * 36 - 300) - 0.2 * (2.4 * 36 + 10) + 0.552 * 36

Next, perform the multiplications and additions/subtractions within each set of parentheses:

0.02 * (50.4 - 300) - 0.2 * (86.4 + 10) + 0.552 * 36

0.02 * (-249.6) - 0.2 * (96.4) + 19.872

Now, evaluate the remaining multiplications:

-4.992 - 19.28 + 19.872

Finally, perform the additions and subtractions:

-4.992 - 19.28 + 19.872 = -4.4

Therefore, the simplified expression, when evaluated for x=36, is -4.4.

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Answer:

its true because standard deviation is the only way out to find any solution

Answer:

5.09

Step-by-step explanation:

your welcome...........

Use the form  a  sin  ( b x − c ) + d  to find the amplitude, period, phase shift, and vertical shift.

Amplitude:   100

Period:  π /  25

Phase Shift:  2 /5  (  2 /5  to the right)

Vertical Shift: 0

The set {h| 0 ≤ h ≤ 60} describe the domain of p(h).

According to the statement

We have given that the brenton gets paid $20 per hour for the first 40 hours he works in a week. For any hours above that, he is paid overtime at $30 per hour.

and we have to find that the those set which describes the domain of p(h).

So,for this purpose

In this case, the domain represents the set of hours he is permitted to work

From the question, we understand that he cannot work more than 60 hours

This means that, the least number of hours to work is 0, and the highest is 60

So, the domain is 0 to 60

When represented properly, the domain of P(h) is (b)  {h| 0 ≤ h ≤ 60}.

So, The set {h| 0 ≤ h ≤ 60} describe the domain of p(h).

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Disclaimer: This question was incomplete. Please find the full content below.

Question:

Brenton’s weekly pay, P(h) , in dollars, is a function of the number of hours he works, h. He gets paid $20 per hour for the first 40 hours he works in a week. For any hours above that, he is paid overtime at $30 per hour. He is not permitted to work more than 60 hours in a week. Which set describes the domain of P(h)? {h| 0 ≤ h ≤ 40} {h| 0 ≤ h ≤ 60} {P(h)| 0 ≤ P(h) ≤ 1,400} {P(h)| 0 ≤ P(h) ≤ 1,800

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Answer:

B.{h|0<h<60}

Step-by-step explanation: