What is 42.5% as a fraction in simplest form?

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.

What is the 12th term of b(n)=-4-2(n-1)

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees