An album contains x black-and-white photographs and y color photo graphs. if the album contains 24 photographs which of the following cannot be true? a. x=2y b. x=3y c. x=4y d. x=5y

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?