Determine the area of a square with a side length of 4a2b3

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?

What is a graph with a never ending line called?

Don't know how to find x given these segment lengths