A marathon is 26 miles 385 yards long. That is about 1.4 times 10 to the 5th power feet. How many feet long is half a marathon?

If you know that a full marathon is about (1.4X10^5) feet, then you can just divide that by 2. To get the most accurate answer on a calculator make sure to put that value in parenthesis before dividing it. I got 70,00. Hope this helped!