A root is like the opposite of a power, so it becomes the denominator of the fraction in the power. 3 stays as the numerator, and 5 is the denominator. So you want the one to the power of 3/5 (D). I know you just wanted the letter answer, but I hope this helps!
The answwer
20% of <span>$1,580.00 is X= 1,580 x20/ 100 = $316
</span>
the amount of his paycheck was <span> $316</span>
30/50 = 3/5 which is 0.6
30/50 Get rid of the zeros = 3/5 then you divide them and get .6