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Fish have the capacity to swim and think. Since exactly the same applies to elephants, elephants are a type of fish.

Do I need to represent both "swim" and "think" as separate variables when diagramming, or do they get combined into one?

doesnt matter

it depends. For this its fine to do them together. In some cases it might be important to parse.

F > ST

E > ST

therefore E=F

mistake is that necessary(ST) is not sufficient for F

Thank you! Also, what is the best and most accurate way to represent the conclusion here? The Powerscore Bible doesn't make a reference to any equals sign or notation similar to it, so I just used a standard If/Then arrow (though I was fairly certain it was incorrect).

i just did that equals sign ad hoc. I don't know what the accepted way to do that would be.

Actually, its basically a categorical syllogism.

All F are S and T(class of animals that can swim and think)
All E are S and T
therefore All E are F (obviously there can be animals that can both swim and think but not be F)

also don't expect powerscore to be comprehensive, it will fail you.