What is an angle that is adjacent to CDI?

Does anyone know this? the andwer choices are: 79, 85, 101, and 135 degrees!

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.

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b