How do u evaluate these expressions I'm so confused I don't know what to do help please

First of all, you need to understand the general formula to fractional index.
a^ m/n = (n_a)^m .
^ stands for TO THE POWER OF,
/ stands for DIVIDE,
_ stands for root.
Real sorry as I'm typing this on my phone, as my laptop is currently under repair.
To continue,
you need to apply what the question is asking for.
I read your answer to the first question and its wrong, it should be (3_8).
The power of 1 means that it is as it is, as any number to the power of 1 is itself.
Lastly, 8 cubed root is 2 as 8=2x2x2.
Hope this helps. ;)

I’d go with b hope it