What does the expression (x+3)(9) represent? Why?

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.

Combine the information in the problem and the chart using the average balance method to solve the problem.

Which of the functions graphed below has a removable discontinuity?