Please helps me answer these study guide questions for my final coming up!

Managers should use straight-line depreciation when making decisions. Select one: True O False Input 1 Input 2 Input 3 Price $20 $30 $40 Marginal Product A B C Refer to the table above. If A= 6 and B= 9, for which value of Cis the firm minimizing costs? Select one: O A 12 O B. 20 OC. 9 O D. 6 The long-run profit-maximizing quantity is found by setting the long-run marginal cost equal to the long-run average cost Select one: O True O False