Please help answer this question

Question

Answer 1

V=hpir^2 = (10.5)pi(3)^2 = 94.5pi = 296.88 in^3

pi= about 3.14159, that's between 3 and 4, much closer to 3

3 x 94.5 = 283.5

4 x 94.5 is a little less than 400

of the 4 choices, only 296.88 is in the right range.