Suppose that the probabilities of a customer purchasing 0, 1, or 2 books at a book store are 0.4, 0.2, and 0.4, respectively. What is the expected number of books a customer will purchase?

Runner ran 1 4/5 miles on monday and 6 3/10 on tuesday. how many times her monday’s distance was her tuesdays distance

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?