Find the value of c that makes x^2+20x+c a perfect square trinomial. And then write expression as the square of a binomial.

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?

Match the one-to-one functions with their inverse functions.

Zack and tia played chess for 50 min they put the chessboard away at 11: 20 when did they start