A. -17=8-n
because The word is is the equal sign and eight less is 8 minus an number
Yes. A monomial is a term composed by a coefficient and powers of variables multiplied with each other, for example

is a monomial.
In your case, the monomials are

As the name suggests, a trinomial is the sum of three monomials, which is exactly your case.
Answer:
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With 98x50 its like there are 98 fiveties. In 97x 50 there are 97 fiveties. There is one more 50 in 98x50.