()=^3 ^2 5+7

R(Q)= 70Q-Q^2

MC(Q)= 3Q^2-2Q-5

MR(Q)= 70-2Q

Plot the marginal revenue function, the marginal cost function, and the cost function in as much detail as possible for positive levels of production (to earn full marks, you need to include all the local maxima and minima, all intercepts, and any inflection points). (Note: The cost function should not have any positive zeros).