Question

9^3/2

Answer 1

9x9x9= 729/2
unless you meant 9^(3/2) in which case it would be the square root of 729 which is 27

Answer 2

easier if you take the square root first. the square root of 9 is 3
3 cubed is 27

Answer 3

well, easier for me in any case. your choice