Answer :

hidden quetsions are somethings that gives you a little more information about that word problem that you probaly didnt notice before and they are important because if they are missed in the problem the whole thing can be wrong
they are questions that are not specifically stated in the problem exg

you have a triagle
2 side angles add up to 30, find the 3rd angle

you have to remember that the 3 angles add up to 180

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