Question

Need help with this ASAP, this is my last class and I need to finish it by Today

Answer 1

volume of a cone = 1/3(pi)(r)^2(h)
640 = 1/3(3.14)(r^2)(12)
640 = 1.05(r^2)(12)
640 = (12.6)(r^2)
divide 12.6 on both sides
50.79 = r^2
square root on both sides because r is squared
7.13 = r

so the answer is 7.13