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Answer:

Step-by-step explanation:
Theorem: In the right triangle the leg is the geometric mean of the hypotenuse and the segment of the hypotenuse adjacent to the leg.
Based on the theorem above,

To find the answer of this problem you need the formula for a cylinder.
V= pi* r^2 * h just plug in your numbers and you have the answer.
You also need to remember that diameter is just twice the radius.
Answer: C & E
40% is equal to 0.4 as a decimal. As a fraction it is equal to 2/5 in simplest form.
In order to find the present you would have to multiple one of the numbers above by the initial value 84.
If you would like further explanation let me know. :)