Question 23 Find the derivative d/dQ (20 + 20 ln Q)^2. [1] (20 + 20 ln Q) [2] 800/Q (1 + ln Q) [3] 40/Q (1 + ln Q) [4] 40/Q (1 + 20 ln Q) [5] None of the above Question 24 Suppose the total cost (in rand) of manufacturing radios is given by TC = 2Q^3 - Q^2 + 80Q + 150, where Q is the number of radios manufactured. What is the marginal cost if 10 radios are manufactured? [1] R80 [2] R660 [3] R700 [4] R2 850 [5] None of the above Question 25 Integrate the function f(x) = 2 / (2x + 1)^4 [1] -1 / (2x + 1)^5 + c [2] -16 / (2x + 1)^-5 [3] -1 / 3(2x + 1)^3 + c [4] 1 / 3(2x + 1)^3 + c
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