What is the muliplicative rate of change of function?

Do 12/14 and 8/10 have the same value? explain your answer.

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.

Convert 2000 swiss francs to dutch guilders