What are the steps to answer the 3 questions ?

You are the marketing manager for Puzzles R Us. The revenue for the Izompanvr is giventh(I) = %(x3 +513:2 + 1150:: 500) where no: is revenue in thousands of dollars and x is the amount spent each month on. advertisement, in thousands of dollars. 0 g x E 25 At what level of advertising spending does diminishing returns start? How much revenue will the companv earn at that level of advertising spending? What does 0 1:, x 5 25 tell us with respect to this