Solve the radical equation x – 7 = . Which statement is true about the solutions to the radical equation? There are no true solutions. There are two true solutions. There is one extraneous solution, with a value greater than 4. There is one true solution, with a value greater than 6.

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?