The answer for this is -134.3
n has a negative exponent, so you need to rewrite the expression using the negative exponent rule b^-n = 1/b^n
(m^8 1/n^4)^1/4
Now make m^8 a fraction buy giving it a denominator of 1:
(m^8 / 1 1/n^4)^1/4
Multiply the fractions together to get m^8/n^4
Now divide the exponents by 4 to get the final answer of:
m^2/n
Square root of. (4+5)^2 + (-7+7)^2
Square root of 81+0
Square root of 81 is 9. The distance is 9 units
The two numbers in each column have to add to 23
So under 7 you write 16, above 4 you write 19, etc
The rule will say x + y = 23