Question

What are all the subsets of the set?
(-8, 4)

Answer 1

You have an interval there from -8 to 4.
There an infinitely many numbers between -8 and 4.
So any set that includes any numbers between -8 and 4 and only between -8 and 4 (non-inclusive of endpoints) is a subset of (-8,4).

Answer 2

The answers will be
0, (-8), (4)
(-8), (4), (-8,4)
(-8), (4)
0, (-8), (4), (-8,4)

Answer 3

@freckles

Answer 4

It seems you are not using the what ( ) means ...You are using what { } means...
{-8,-4} is different from (-8,-4)