so i have these for homework, i dont udnerstand them due to me having a adhd comprehension problem, is there anyone who can walk me through them?

If you sort the elements in D alphabetically, you end up with

D = {a, b, c, d} = E

so right away we have

1. D ⊆ E is true

D is a subset of E because they are the same set, and any set is a subset of itself

2. D ⊂ E is false

Although D is a subset of E, D is not a proper subset of E because they contain the same elements. This would be true if E had any other elements.

3. E ⊆ D is true

4. E ⊂ D is false

5. D = E is true

We've already established at the start.

6. D ≠ E is false

3 3 6, because in every triangle the longer side is always shorter than the sum of the other two