Hi student, let me help you out! :)
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We are asked to find how many terms are in
.

- A term is a thing that's added or subtracted.
So let's compute the number of terms in this expression.
The first term is
.
Is anything added or subtracted from 10y²?
Sure!
is subtracted from 10y².
Also, 8 is added to -3y.
Thus, this expression has 3 terms.
Hope it helps you out! :D
Ask in comments if any queries arise.
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~Just a smiley person helping fellow students :)