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*12. Ketura sells backpack danglies to tourists for $15 each, so her weekly revenue is R(x) = 15x. The cost of making x danglies per week is given by the formula C (x) = 15 + 8x + 0.0 5x2. Find the marginal prot function, then use it to calculate how many danglies Ketura needs to sell to maximize her weekly prot. (Hint: Prot = Revenue minus Cost). 13. Sketch the derivative f '(x) for this graph of f (x)