Sum of -3x^2x-7x+9 and -5x^2+6x-4

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.

What is the greater volume 72 quarts or 23 gallons

How to use order of operation in 20 divide by 4 multiply 5 = 1