The browser used for posting questions on this site is rubbish. It is quite useless for mathematics since it strips out most symbols so that we cannot tell what the question is meant to be. We could try to guess but in some cases that is not possible and then we may as well make up our own questions and answer them!
Furthermore, this appears to be one expression (or equation) with two variables. In general that does not provide sufficient information for it to be solved.
A fractional exponent is actually finding the nth root of the base. So 80^(3/4) is the 4th root of 80 cubed. This equals 26.750 approximately.
the 4th root of 80 equals 2.9907
-4.30886938
√6400 = 80* * * * *OR -80
√80 = 8.94427191
16
80 times .9
Square root of 81
square root of 125/80 = 1.25 or 5/4
You don't need to use the quadratic formula because:- 5r2 = 80 Divide both sides by 5: x2 = 16 Square root both sides: r = 4
It is: (68/80)*100 = 85%
15% of 80 = 80*15/100 = 12