9. For f(x, y) = Vy + x - 2' find f (3,4) and state the domain of f(x, y). Bonus Section (yay!): Each question will be worth a total of 5 points. Please be sure to show all work. 1. Given f(x) = x2, find f'(x) by determining limp-to f(ath) - f(2) h2. Let R(ac), C(x), and PM) be respectively, the revenue, cost, and prot in dollars, from the production and sale of ac items. If RM) 2 7m and C(56) = 1:2 5:1: + 6, nd the marginal cost, marginal revenue, and marginal prot functions