A truck is rented at $40 per day plus a charge per mile of use. the truck traveled 15 miles in one day, and the total charge was $115. which equation can be used to find the charge x, in dollars, per mile traveled? (1 point) 40x + 15 = 115 40 + 15x = 115 40x + 15x = 115 40 + 15 = 115x