PLEASE HELP ME IM TOTALY NOT DESPRATE

John bought 5 lemons and used 2 of them for a salad how much did he use for. a salad . he used % of the lemons.

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.

Can someone pls ! pls answer all. no explanation needed..