Answer:
C
Step-by-step explanation:
![7^{\tfrac 14} = \sqrt[4]{7}](https://tex.z-dn.net/?f=7%5E%7B%5Ctfrac%2014%7D%20%3D%20%5Csqrt%5B4%5D%7B7%7D)
It would be 6.0x4 because the square is 6.0 on each side
80-64=24
24 is 30% of 80 so a decrease of 30%
20mn - 30m
As you can see, both numbers are divisible by 10m. So if you were to divide them both, you would be left with, 10m (2n - 3), which would be the correct answer.