It costs $10 $
10
for admission to a carnival and $2.75
$
2
.
75
for each ride ticket. The total cost is =()
C
=
f
(
r
)
, where
r
is the number of ride tickets purchased and ()=2.75+10
f
(
r
)
=
2
.
75
r
+
10
.

Which is the inverse function, −1()
f
-
1
(
C
)
, that can be used to find the number of ride tickets purchased given the total cost?