1331 Suppose the supply function for a certain item is given by S(q] = (q + 9)2 and the demand function is given by D(q) = m. Complete parts a...

I feel confused about b, I use derivative: 1331ln(q+x)-121q, but I calculate 2494.60, so please give me some details.

1331 Suppose the supply function for a certain item is given by S(q] = (q + 9)2 and the demand function is given by D(q) = m. Complete parts a through d below. b. Find the point at which supply and demand are in equilibrium. The equilibrium point is (2,121).(Type an ordered pair. Simplify your answer.) c. Find the consumers' surplus. The consumers' surplus is $ 25.09‘.(Round to two decimal places as needed.) d. Find the producers' surplus. The produoers' surplus is $ 41.33 .