We are given expression for cost of admission at an amusement park : 15a+12c.
Where a is the number of adults and
c is the number of children.
We need to find the total cost of 5 adults and for 10 children.
In order to find the total cost of 5 adults and for 10 children, we need to plug a=5 and c=10 in 15a+12c expression.
Plugging a=5 and c=10 in 15a+12c expression, we get
15(5) + 12(10) = 75 + 120 = $195.
Therefore, the total cost for 5 adults and for 10 children is $195.