Maya's new home had a purchase price of $325,500. Maya and her husband got a 15-year fixed mortgage for 70% of the purchase price. The interest rate on the loan was 2.990%. What was their monthly payment?

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?