**Problem 2** The percent *p* of high school seniors who ever used marijuana can be related to *x*, the number of year after 2000, by the equation 25*p* + 21*x* = 1215.

a. Find the *x* intercepts of the graph of this function.

b. Find and interpret the *p* intercept of the graph of this function.

c. Graph the function using the intercept.