Answer: $77
Explanation:
Using the given expression, we can find the total cost for all the tickets.
The question asks for the cost of 3 adults and 4 children.
Let's substitute the values for the variables(again).
We'll get
15*3+8*4(since there's 3 adults and 4 children)
= 45+32
= 77
Total: $77
Nice airpods, btw