For Mother's Day, Bob made a pop-up card for his mom. He started with a large paper rectangle. Then, Bob cut out a square with an area of 81 square inches from the middle of the large rectangle. The area of the piece Bob had left was 129 square inches. Let r represent the area of the rectangle that Bob started with. Which equation models the problem?

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?

Which of the choices shown could be used to prove that aacp=abcp ?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?