An economist estimated that the cost function of a single-product firm is C(Q) = 17.9 + 12.2Q + 2.3Q ^ 2 + 3Q ^ 3 What is the fixed cost at Q = 10 What is the variable cost at Q = 10' ? What is the total cost at Q = 10' ? What is the average fixed cost at Q = 10' ? What is the average variable cost at Q = 10' ? What is the average total cost at Q = 10 deg ? What is the marginal cost at Q = 10