SOLUTION: The volume of a cylindrical tank is given by the formula V =πh r2 where h is the height of the cylinder and r is its radius. Find the volume to the nearest tenth of a cubic

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Question 107665: The volume of a cylindrical tank is given by the formula V =πh r2
where h is the height of the cylinder and r is its radius. Find the
volume to the nearest tenth of a cubic foot of a cylindrical tank that
has a radius of 3 feet and a height of 5 feet.
a. 47.1 cu. ft.
b. 94.2 cu. ft.
c. 135.0 cu. ft.
d. 141.4 cu. ft.
Answer by solver91311(12126) About Me  (Show Source):
You can put this solution on YOUR website!
Since you are given four possible answers, you can do this one in your head.

The radius is 3, so the radius squared is 9. Multiply that by the height to get 45. Now all we have to do is multiply by pi.

We know pi is a little more than 3, and 3 times 45 is 135. So you can throw out answers a) and b) immediately because they are both too small. We can also throw out answer c) because we know that pi is not exactly 3. That leaves answer d).