change -3 and 3/8 into -27/8, which is the cube of -3/2
change 5 and 4/9 into 49/9, which is the square of 7/3
In case you didn't know how to change, the whole multiple the bottom, and plus the top, ignore the positive/negative sign: 3*8=24, 24+3=27, and 5*9=45, 45+4=49