1-3!! please with work

QUESTION 1 Suppose the revenue a firm generates from advertising is given by R(a) = 40000'5, where a is the number of ads. The cost of advertising is given by do) = 100. Let f(a) = RM) - do) be the revenue from advertising net of cost. What quantity of advertising should the firm choose to maximize f(a)? QUESTION 2 Suppose a rm's revenue and cost functions are R(q) = 160a - 3q2 and C(q) = 40 + qz. What quantity, q, maximizes profit? QUESTION 3 Suppose f(x,y) = 80X - x2 + ny- 3y2. What is the value ofx (noty!) at the turning point? Enter a single number