Answer: R=500+15t
Step-by-step explanation:
Because the initial value is 500, you do not have to add a variable next to it. This value will always stay the same. When he raises 15 dollars per minute, that gives you 15t, if t stands for a single minute. This way, the function should result in R=500+15t, because 500 cannot change in any way as that is the cost of his appearance, and 15, because it changes for every minute he performs.
