A food truck owner charges x dollars Furrito combo and $1.50 for a side of guacamole. The expression 5 (x +1.50) represents the total cost of 5 burrito combes and 5 sides of guacamole. Which expression also represents the total cost of 5 burrito combos, which cost x dollars each, and 5 sides of guacamole, which cost $1.50 each?

5x +1.50
5x +3.50
5x + 6.50
5x- + 7.50