select all of the following expressions that are equivalent to 9^1/2

3^1/2 * 3^1/2
6 to the square root of 27
27^1/3 * 3^1/2
81^1/2 * 81^1/2
729^1/6
81^1/3 * 81^1/3
81^1/4 * 81^1/4

The expressions that are equivalent to 9^(1/2) are:

3^(1/2) * 3^(1/2)
27^(1/3) * 3^(1/2)
81^(1/2) * 81^(1/2)
81^(1/3) * 81^(1/3)
81^(1/4) * 81^(1/4)