Question 13 5 pts If Y is output, given as a function of an input, X, TC is total cost, given as function of Y, then the marginal cost given as a function of Y is calculated as O The slope of TC with respect to Y The slope of a ray from origin to the point on the TC function O Both a and b O None of the above Question 14 5 pts If Y is output, given as a function of an input, X, TC is total cost, given as a function of Y, then the marginal cost, MC, given as a function of Y is calculated as O MC = TC/Y O MC = Y/X O MC = - _drc dy O The first derivative of TC with respect to X