Which expression is equivalent to -4-9

What are the soultion(s) to the quadratic equation 40- x^2=0

What is the binomial expansion of (2x-3)^5

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.