Part (a)
Part (a). 25. Profit = 120x – ∫ 6 √ x. 0. 25. Profit = 120(25) – 4[x 3/2 ]. 0. Profit = Sale price - Cost. Profit = $2500. Part (b). This represents the cost, in dollars, of building the last five meters of a 30 meter cable. Part (c). k. Profit = 120k – ∫ 6 √ x. 0.
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