Explanation for Question 21 From the Math (Calc) Section on the 2018 March Sat
Question 21 asks, which of the following is equivalent to the expression above for 2 all values where X is greater than zero, 3 where a and B are positive and integers. 4 So whenever you have a variable that is to 5 a power and under a root, 6 you can change that into just a power of fractional power. 7 And the way you do that is you take the power under the room. 8 And that becomes the numerator and the power of the 9 brute, uh, becomes the denominator. 10 So this becomes X to the B over a, 11 and the correct answer is.