HELP ME SOLVE THIS QUESTION PLEASE!! THIS MAY BE MY EXAM QUESTION.
A company that produce can foods with with a production cost function given by C(x)=84 + 1.26x -0.01x^2 + 0.00007x^3
and a demand function is given by P(x)= 3.5 - 0.01x

(a) Find the revenue function.
(b) Find the marginal revenue function.
(c) Find the marginal cost function.
(d) Find the production level that will maximize the profit for the company.