With the values provided, we can find both the volume and surface area.
Volume:
Formula = pi x r^2 x h
---r is the radius, h is the height
Volume = pi x (3)^2 x 7
Volume = pi x 36 x 7
Volume = 252pi mi^3 = 791.68 mi^3
Surface Area:
Formula = 2 x pi x r x h + 2 x pi x r^2
---r is the radius, h is the height
Surface Area = 2 x pi x 3 x 7 + 2 x pi x (3)^2
Surface Area = 42pi + 18pi
Surface Area = 60pi mi^2 = 188.50 mi^2
Hope this helps!