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Math homework (recent questions)

The average retail cost of a DVD player x years after 1998 is given by C(x) = 0.646(x)^3 + 9.09(x)^2 - 53.8(x) + 237. What is the average cost to the nearest dollar of a DVD player in 2002?
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There is a point A in the ocean that is 1 mile from shore. There is a point B on land which is 4 miles down the shore and 2 miles away from the ocean. Write a one-variable expression for how long it takes to get from point A to point B. I'm guessing the traveler is both swimming and walking, but the problem doesn't say.
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