Solve 2x+5=19 plz step by step

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.

The table represents a linear function. what is the slope of the function? –6 –4 4 6

Which of the following is the true for f(x) = 5cos