Final answer:
To calculate the total amount of money Sadie would have to pay for her family, we need to add the cost of the movie tickets and the snacks together. If Sadie bought 6 snacks for everybody to share, she would have to pay $87 for her family. If she bought x snacks, the total cost would be $60 + $4.50x.
Step-by-step explanation:
To calculate the total amount of money Sadie would have to pay for her family, we need to add the cost of the movie tickets and the snacks together. Each movie ticket costs $15, and if Sadie is taking her 4 kids, she would need to buy 4 tickets, which gives a total cost of 4 * $15 = $60 for the tickets. If she were to buy 6 snacks for everybody to share, each snack costs $4.50, so the total cost of the snacks would be 6 * $4.50 = $27. Adding the cost of the tickets and snacks together, Sadie would have to pay $60 + $27 = $87 for her family.
If Sadie were to buy x snacks for everybody to share, each snack still costs $4.50. Therefore, the total cost of the snacks would be x * $4.50. Adding this to the cost of the tickets, Sadie would have to pay $15 * 4 + x * $4.50 = $60 + $4.50x for her family if she bought x snacks for everybody to share.