Assume that the height of your cylinder is 6inches.ConsiderAas a function ofr, so we can write that asA(r)=2r2+12r. What is the domain ofA(r)? In other words, for which values ofrisA(r)defined?

Continue to assume thatthe height of your cylinder is 6 inches. Write the radius ras a function of A. This isthe inverse function to A(r), i.e to turn Aas a function of rinto.ras a function ofA.

If the surface area is 225 square inches, then what is the radiusr? In other words, evaluate r(225).Round your answer to 2 decimal places.