Question

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?

Answer 1

Answer:

Length of half marathon = 7 x 10⁴ feet

Step-by-step explanation:

Length of marathon is given as 1.4 x 10⁵ feet

            Length of full marathon = 1.4 x 10⁵ feet

Length of half marathon is half the length of full marathon.

$\texttt{Length of half marathon = }\frac{\texttt{Length of full marathon}}{2}\\\\\texttt{Length of half marathon = }\frac{1.4\times 10^5}{2}=0.7\times 10^5\\\\\texttt{Length of half marathon = }7\times 10^4feet$

Length of half marathon = 7 x 10⁴ feet

Answer 2

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!