Which graph does the point (-1,3) belong to

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.

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Which of the following expressions is equal to 2x^2+8