given this gragh I need help with the following queations. 1. Suppose the firm's price is regulated at $80. a. What is the firms marginal revenue if it produces 7 units? b. If the firm is able to cover its variable costs at the regulated price, how much output will the firm produce in the short run to maximize profits? c. in the long run, how much out put will the firm produce if the price remains regulated at $80? I keep getting these wrong and need help.