I’m not hundred percent sure but i’m pretty sure it’s d.

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.

Select the sequences that are geometric.

Three times the sum of a number and seven is negative thirty-six. what is the number?