Business: Cost (continuation) Graph the cost function on the window [0, 30] by [210, 70]...

Business: Cost (continuation) Graph the cost function on the window [0, 30] by [210, 70]. Then use NDERIV to define y₂ as the derivative of y₁. Verify the answer to Exercise 57 by evaluating the marginal cost function y₂ at x = 20.

REF PRB:

Business: Cost A company’s cost function is dollars, where x is the number of units. Find the marginal cost function and evaluate it at x = 20.