John is planning to purchase a new car that costs $15,500. on average, a new car loses 11% of its value the moment that it is driven out of the lot. once john drives his new car off the lot, what will its value be?

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?