Desperately need help for math

Answer:
If the radius is 1, the volume will be approximately 22 [tex]in^3[/tex].
If the radius is 2, the volume will be approximately 88 [tex]in^3[/tex].
If the radius is 3, the volume will be approximately 198 [tex]in^3[/tex].
There is a linear relationship between the radius and the volume of these cylinders.