Help! Write a recursive for formula

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.

Divide. write in simplest form 41/6 divided by 10

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid