Answer:
156.429
Step-by-step explanation:
52.1428571 in one year x 3
Assignment: 
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Answer: 
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Explanation: 
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[ Step One ] Subtract 18 From Both Sides

[ Step Two ] Simplify

[ Step Three ] Solve With Quadratic Formula
Note: 


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[ Step Four ] Combine Solutions

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Answer:
Infinitely many solutions
Step-by-step explanation:
When the solved system has the same number on each side, the system has infinite solutions.
97.45 • 0.18 = 17.54. 97.45 + 17.54 = 114.99. I think this is right.
(a) First find the intersections of

and

:

So the area of

is given by

If you're not familiar with the error function

, then you will not be able to find an exact answer. Fortunately, I see this is a question on a calculator based exam, so you can use whatever built-in function you have on your calculator to evaluate the integral. You should get something around 0.5141.
(b) Find the intersections of the line

with

.

So the area of

is given by


which is approximately 1.546.
(c) The easiest method for finding the volume of the solid of revolution is via the disk method. Each cross-section of the solid is a circle with radius perpendicular to the x-axis, determined by the vertical distance from the curve

and the line

, or

. The area of any such circle is

times the square of its radius. Since the curve intersects the axis of revolution at

and

, the volume would be given by