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24. A company estimates that the revenue (in dollars) from the sale of x doghouses is given by R(x) = 13,000 In (0.02x + 1). Use the differential to approximate the change in revenue from the sale of one more doghouse if 70 doghouses have already been sold. The revenue will increase by $ if one more doghouse is made. (Round to the nearest cent as needed.) ID: Bus Econ 6.6.19 25. Find the indefinite integral (12x + 5)dx. ( 12 x + 5 ) dx = ID: 7.1.7 26. Find the cost function if the marginal cost function is C'(x) = 3x -5 and the fixed cost is $12. C(x) = ID: Bus Econ 7.1.45 27. Use substitution to find the indefinite integral. 7 ( 7x - 14 ) 5 dx [ 7(7x-24) 5 ax= ID: 7.2.3 28. Use substitution to find the indefinite integral. 2182 2 - 8 dz 2 872 - 8 dz=