Will give brainiest lol

Evaluate the dot product of (3,-1) and (1,5)

The solution set for 5v2 – 125 = 0 is

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.