I cannot figure this problem out.

A and C.

Step-by-step explanation:

to get rid of the square root & n, you would have to multiply it by n on both sides of the equation, giving you r^n=a.

also to get rid of the square root & n, you can also multiply both sides of a and r by the exponential fraction with n as the denominator:

21

step-by-step explanation:

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5