137 1/4 sq ft or the measurement
Ok ok so 28 because 9+9 is 18 and then 5+5 is 10 so you add them up and then 28
Answer:

Step-by-step explanation:
Given in the question an expression,

As we know that,
![x^{\frac{1}{4} }= \sqrt[4]{x}](https://tex.z-dn.net/?f=x%5E%7B%5Cfrac%7B1%7D%7B4%7D%20%7D%3D%20%5Csqrt%5B4%5D%7Bx%7D)
so
![\sqrt[4]{256x^{16} }](https://tex.z-dn.net/?f=%5Csqrt%5B4%5D%7B256x%5E%7B16%7D%20%7D)
it could also be written as

First to solve inner square root


Second outer square root
=
10^2+8^2-7^2/(2*10*8)
= 115/160 = 0.71875 round off to 0.72
I believe that the answer is A. 45 but if I am wrong I am so sorry I was just trying to help.