In the simplest sense, positive means good or the opposite of negative. If you have a positive attitude about homework, for example, you're more likely to get positive feedback on your report card.
I think the adjective in the sentence is
Glass
Yes it is a expository writing
"Pools were made of independent companies, but a trust was not" is the one among the following choices given in the question that shows how <span>a pool differ from a trust. The correct option among all the options that are given in the question is the fourth option or option "D". I hope it helps you.</span>
D
because it says used which is past tense
