HELP ITS NOT MULTIPLE CHOICE
I don't know if you can download it but if you can't someone tell me how to fix it

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?

Find the value of x for which abcd must be a parallelogram -9-6x x-30

Ivan and jeff buy a package of 8 pens for $4.00. ivan wants 5 of the pens, and jeff wants 3.how much should each student pay?