Which of the following could be a real-world description of 5x − 18? (I ALSO NEED THIS FAST)
A: $18 in addition to the cost of 5 hot dog combos
B: The cost of 18 people splitting 5 hot dog combos
C: The cost of hot dog combos less an $18 coupon split by 5 people
D: $18 less than the cost of 5 hot dog combos