What expression is equivalent to 5(t+6)

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.

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What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4