Step-by-step explanation:
A) The volume of a cone is [tex]\frac{1}{3} \pi r^{2}h[/tex], so this is (6)(6)(8)(pi)/3 = 96pi, which is approx. 301.4
B) [tex]\pi r^{2}h[/tex], is the volume of a cylinder. This means the volume is (21)(5)(5)(pi) = 525pi, which is approx. 1648.5
C) The volume of a sphere is s [tex]\frac{4}{3} \pi r^{3}[/tex] meaning that the volume is (20)(20)(20)(4)(pi)/(3) = 32000/3 pi, which is approx. 33493.3
