I'm a parent and I my son had a test and this problem was wrong so I'm here trying to figure it out (3/4)3 can you help me please thank you

Answer 1

(3/4)(3) = 9/4 or 2 1/4

line up 3 sets of 3 quarters
now count the quarters, you should see 9 quarters or
$ 9/4, or $2 dollars and 1 quarter, or $2.25

Answer 2

if you meant:
(3/4)^3 , then

= (3/4)(3/4)(3/4)
= 27/64