You purchase a car for $40,582 in 2015 that has a history of depreciating at 12% each year. if you want to see the car for no less than $8,000, in what year should you sell?

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?