(9) Evaluate the integral or state that it diverges. 20 5 *(x + 1)x Select the correct choice and, if necessary, fill in the answer box to complete your choice. O A. The integral converges to 5 x(x + 1) dx =[. (Type an exact answer.) (11) A company determines that its marginal cost, in dollars, for producing x units of a product is given by C'(x)=2800x ", where x 2 1. Suppose that it were possible for the company to make infinitely many units of this product. What would the total cost be? The total cost would be $ . (Round to the nearest integer as needed.)