Sagot :
Answer:
×2+2×+5 Sence all of the variables have integers exponents that are possitive this is a polynomial.
5×+1 Since all of the variables have integer exponent that are positive this is a polynomial.
(×7 +2×4 -5)×3 Since all of the variables have integers exponent that are positive this is a polynomial.
THAT' IT.:)