1.) First plug in the values for m and A:
[tex]2555 = 139(4) + b[/tex]
--> [tex]2555 = 556 + b[/tex]
Isolate b: [tex]2555 - 556 = 556 - 556 + b[/tex]
b = 1999
So your answer is the first option.
2.) Admission costs $5.25, so even if you don't go on any rides, you will still have to pay $5.25. This means that for this problem, 5.25 will be the b value. If each ride costs $2.50, then this means it is $2.50x for the cost of x rides. The total cost will then be [tex]C = 5.25 + 2.50x[/tex].
