What is the sign product of (-4)(2)(-3)(6)

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 y-intercept of the line given by the equation

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?