One cell phone plan costs $39.95 per month. The first 500 minutes of usage are free, each minute after that casts $.35. Write a rule t

One cell phone plan costs $39.95 per month. The first 500 minutes of usage are free, each minute after that casts $.35.  Write a rule that describes the total monthly cost of a function of the number of minutes of usage (over 500 minutes). Then find the number of minutes usage over 500 minutes for a bill of $69.70.

 

 

PLEASE AND THANKYOU!