I need help, for this you need to simplify all the expressions and put them in the box, than find a matching pair and put them together but I am confused on the questions

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?

How many and of which kind of roots does the equation f(x)=x3−x2−x+1

What is the equation of the parabola with focus (-1,-1) and directrix y=1?