Answer: The output is 51.5
$51.50 is the cost for Gale and three friends.
Step-by-step explanation:
If the input is 3, substitute 3 for f in the function.
Multiply 12(3)=36
Add 36 to the c.
15.5 + 36 = 51.50
The total cost for Gale and three friends is $51.50
