I need help with the following questions please.

A record club has found that the marginal profit, P'(x), in cents, is given by P'(x) = - 0.0007x" +0.40x" + 35. 1x for x 500, where x is the number of members currently enrolled in the club. Approximate the total profit when 300 members are enrolled by computing the sum _ P' (x;) Ax with Ax = 50. 34,000 (X)= -0.0007x5 + 0.40x2 + 35.1x i=1 27,200- 20,400- Marginal profit (in 13,600- 6,800- III IV V V 100 200 300 400 50 0 Number of members The total profit when 300 members are enrolled is approximately $. Round to the nearest cent as needed.)Find the area of the region bounded by the graphs of the given equations. y = x, y = Vx X -0.25 -0.25- Set up the integral(s) that will give the area of the region. Select the correct choice below and fill in any answer box(es) to complete the choice. A. dx OB. [ [ ]ax The area is (Type an integer or a simplified fraction.)