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225/100 of last years cost. write each fraction as a decimal and as a percent

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.