If AC = 2x + 3 and DB = 4x - 1, find x.

What is the prime factorization of 195

How many ordered pairs of positive integers satisfy xy=32?

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?