Given f(x)=2x8, compute f(6)f(2) f(6)f(2)= Consider the marginal cost function C(x)=0.09x22x+100. a. Find the additional cost incurred in dollars when production is increased from 5 units to 8 units. b. If C(5)=311, determine C(8) using your answer in (a). a. The additional cost incurred in dollars when production is increased from 5 units to 8 units is approximately $ (Do not round until the final answer. Then round to two decimal places as needed.)