. (04.07) Luke is keeping track of the total number of hours he exercises. He started the summer having already put in 15 hours, and he then exercises 7 hours each week. The function to keep track of his exercise is f(x) = 7x + 15. What do the f(x) and x represent in Luke's situation?

Answer:f(x) is the total number of hours exercised and x is the number of weeks.Explanation:In function notation, we can see which variable is independent.  In this case, x is the independent variable.In the problem situation, the two quantities (variables) are weeks and amount of exercise; the amount of exercise would depend on how many weeks have passed, so weeks is the independent variable, or x.This means that exercise is a function of weeks.  This means that f(x) is the amount of exercise, and x is the number of weeks.