Can someone answer. there is only one problem. there's a picture. you!

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?

Diane owes $387 to her brother. if she debits her bank account $161.25 a month to pay him back, how many months will it take her to pay off the debt?

Brainlest answer can you find the area and circumference of a circle given the radius or diameter? if its yes or no explain why