Answer:
or

Explanation:
Money taken to the fair = $90
Money spent to enter the fair = $5
Money spent on food =$15
Total he spent now is given by :
dollars
Let the number of rides be = x
And he spends $1.50 on each ride, so total money spent on rides =

Total money including rides can be shown as:

Now money left after this will be

=

Let f(x) denotes the function used to determine the money left after rides,
or
