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NemiM [27]
3 years ago
10

What the answer question now

Mathematics
1 answer:
RUDIKE [14]3 years ago
6 0

Step-by-step explanation:

<em>Here</em><em>,</em>

<em>radius</em><em> </em><em>(</em><em>r</em><em>)</em><em>=</em><em> </em><em>2</em><em>cm</em>

<em>height</em><em>(</em><em>h</em><em>)</em><em>=</em><em>5</em><em>cm</em>

<em>now</em><em>,</em>

<em>according</em><em> </em><em>to the</em><em> </em><em>question</em><em> </em><em>we must</em><em> </em><em>find the</em><em> </em><em>surface</em><em> </em><em>area of cylinder</em><em> </em><em>so</em><em>,</em>

<em>by</em><em> </em><em>formulae</em><em> </em><em>,</em>

<em>a</em><em>=</em><em> </em><em>2.pi.r</em><em>(</em><em>r</em><em>+</em><em>h</em><em>)</em>

<em>now</em><em>,</em><em> </em>

<em>a</em><em>=</em><em> </em><em>2</em><em>×</em><em>3</em><em>.</em><em>1</em><em>4</em><em>×</em><em>2</em><em>(</em><em>2</em><em>+</em><em>5</em><em>)</em>

<em>by</em><em> </em><em>simplifying it we get</em><em>, </em>

<em>The</em><em> </em><em>surface</em><em> </em><em>area of cylinder</em><em> </em><em>is</em><em> </em><em>8</em><em>7</em><em>.</em><em>9</em><em>2</em><em> </em><em>cm</em><em>^</em><em>2</em><em>.</em>

<em><u>Hope it helps</u></em><em><u> </u></em>

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Almost all employees working for financial companies in New York City receive large bonuses at the end of the year. A sample of
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Answer:

The 90% confidence interval for the average bonus that all employees working for financial companies in New York City received last year is between $43,819 and $50,181

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

T interval

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 62 - 1 = 61

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 61 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 1.67

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 1.67\frac{15000}{\sqrt{62}} = 3181

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 47000 - 3181 = $43,819

The upper end of the interval is the sample mean added to M. So it is 47000 + 3181 = $50,181

The 90% confidence interval for the average bonus that all employees working for financial companies in New York City received last year is between $43,819 and $50,181

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2 years ago
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4 0
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What is the coordinates of the center of an ellipse defined by the equation 16x^2 + 25y^2 + 160x - 200y + 400 = 0 ? Please give
pickupchik [31]

16x^2 + 25y^2 + 160x - 200y + 400 = 0     Rearrange and regroup.

(16x^2 + 160x) + (25y^2 - 200y ) = 0-400.     Group the xs together and the ys together.

16(X^2 + 10x) + 25(y^2-8y) = -400.     Factorising.

We are going to use completing the square method.

Coefficient of x in the first expression = 10.

Half of it = 1/2 * 10 = 5. (Note this value)

Square it = 5^2  = 25.     (Note this value)


Coefficient of y in the second expression = -8.

Half of it = 1/2 * -8 = -4. (Note this value)

Square it = (-4)^2  = 16. (Note this value)


We are going to carry out a manipulation of completing the square with the values

25 and 16.  By adding and substracting it.


16(X^2 + 10x) + 25(y^2-8y) = -400

16(X^2 + 10x + 25 -25) + 25(y^2-8y + 16 -16) = -400

Note that +25 - 25 = 0.    +16 -16 = 0. So the equation is not altered.

16(X^2 + 10x + 25) -16(25) + 25(y^2-8y + 16) -25(16) = -400


16(X^2 + 10x + 25) + 25(y^2-8y + 16)  = -400 +16(25) + 25(16)    Transferring the terms -16(25) and -25(16)

to other side of equation.  And 16*25 = 400


16(X^2 + 10x + 25) + 25(y^2-8y + 16)  = 25(16)


16(X^2 + 10x + 25) + 25(y^2-8y + 16)  = 400

We now complete the square by using the value when coefficient was halved.


16(x-5)^2 + 25(y-4)^2  = 400

Divide both sides of the equation by 400


(16(x-5)^2)/400 + (25(y-4)^2)/400  = 400/400              Note also that, 16*25 = 400.


((x-5)^2)/25 + ((y-4)^2)/16  = 1

((x-5)^2)/(5^2) + ((y-4)^2)/(4^2)  = 1


Comparing to the general format of an ellipse.

((x-h)^2)/(a^2) + ((y-k)^2)/(b^2)  = 1


Coordinates of the center = (h,k).

Comparing   with above   (x-5) = (x - h) , h = 5.

Comparing   with above   (y-k) = (y - k) , k = 4.

Therefore center = (h,k) = (5,4).

Sorry the answer came a little late.  Cheers.

3 0
3 years ago
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