Dewanna needs to save 1,500 by august to pay for her tuition she only has 12 weeks remaining before she starts school and her boss is letting her work 20 hours per week she brings home about 9$ an hour after taxes are withdrawn from her check. Is it possible for her to save the 1,500?

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?