What is f(r) = 60 - 2/3 r when r =12?

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?

Taking algebra two apex courses and need with these questions

How many zeros does this polynomial function, y=(x-8)(x+3)^2