6. The marginal cost of producing handbags is given as C'(x) = 115+32r. If the cost of producing 10 handbags is $4755, obtain the cost function for producing a handbags. 7. Integrate the function y = 3x with respect to a from -1 to 3. 8. Given the marginal cost function C'(x)=10+50x + x, find the cost function if the fixed cost of production is 1000. 9. Given the marginal cost function C'(x) = 10 + 50, find the cost function if the fixed cost of production is 10000. Then, calculate the cost of production for 500 units of the product in question. 10. A company produces a printer that also scans documents. The research department produced the marginal cost function C'(x)=200-where C(r) is the total cost (in dollars) and r is the number of printers produced in a month. Compute the increase in cost going from a production level of 100 printers per month to 500 printers per month. Set up a definite integral and evaluate.