Bobby has 3 times as many model spaceships as his friend sylvester does. bobby has 21 spaceships. how many model spaceships does sylvester have?

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 this inequality notation? t is less then or equal to 2

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?