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What is the equation of the line that best fits the given data?

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?

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid