Table salt is considered a(n)
because it conducts electricity in water.

I'm not sure what your answer choices are but I would consider it a conductor.

Explanation: Things that conduct anything are conductors.

I hope that this will help, good luck.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.