Jordan found cloth for $7.50 per yard. How much would his total cost be if he needed 12 yards of cloth?

What is the solution to the inequality

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?

What is the simplified form of square root of 400 to the 100th power ?