Question 1037779
Volume for a cylinder:  {{{pi*r^2*h}}}, h is length top to bottom and r is radius.  If let d be diameter, then {{{d/2=r}}}.


Volume for a cone:  {{{(1/3)pi*r^2*h}}}  or {{{(1/3)pi(d/2)^2*h}}}, variables meaning same as used earlier although values may be different.


Only doing question part c.
Capacity of the grain bin:
{{{(15*pi*(19/2)^2+6*(1/3)pi*(19/2)^2)*cubicFeet}}}

{{{15pi(19/2)^2+2pi(19/2)^2}}}

{{{(15+2)(pi*(19/2)^2)}}}

{{{17*pi(19/2)^2}}}

{{{highlight(6137pi/4)}}}----------cubic feet, capacity of the grain bin.