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?

Question

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?

1.f(x) represents the total number of hours; x represents the number of weeks he exercises this summer.
2.f(x) represents the total number of weeks he has exercised; x represents the number of hours.
3.f(x) represents the number of hours he exercises per day; x represents the number of weeks.
4.f(x) represents the total number of hours he has exercised; x represents the number of hours he exercises per day.

Answer 1

7 hours each week depends on how many weeks (x)

The 15 is what he had when x=0