Which equation is the inverse of y=3x?

Which expression is equivalent to 4 square root 6 divided by 3 root 2

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.

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?