Could someone check my answers?

Question

27. (16/9)^2/3 = 64/27

28. (49/25)^3/2 = 343/125

31. (-64)^2/3 = 8

32. (-8)^-4/3 = 1/16 or -1/16

Answer 1

27. nope. (16/9)^3/2 = 64/27
you make a typo?

28. ok

31. (-64)^1/3 = -4
(-4)^2 = 16

32. again with the - sign
even powers are always positive
(-8)^1/3 = -2
(-2)^4 = 16

Answer 2

(-2)^-4 = 1/16

Answer 3

Thank you for your help