Erica and Jason deposit money into their savings accounts at the end of each month. the table shows the account balances. if their patterns of saving continue, and neither earns interest nor withdraws any of the money, how will the balances compare after a long time?

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?