What is the range of the function on the graph

Little’s law firm has just one lawyer. customers arrive randomly at an average rate of 6 per 8 hour workday. service times have a mean of 50 minutes and a standard deviation of 20 minutes. how long does a customer spend at little’s law firm on average?

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

How many verticies does a triangular prims have