How do I do this -16x =-160

Find the x coordinate of the point.

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.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?