What is the value of x 10 7

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

What is the point-slope form of the equation for the line with a slope of -2 that passes through (1,4)?

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.