The answer will depend on what r is.
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r2+6r-7 = (r+7)(r-1) when factored
-45/7 = -6.428571
A=pi * r2 r= 3.5 A= 3.14 * 12.25 A=38.48
r2 (r2) refers to the radius of the cylinder squared.
Vol = pi*r2*h = 3078.761 cubic units, approx.