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Answer:

(i) x5-2x3+x+7 is an expression having only non-negative integral powers of x. So, it is a polynomial. Also, the highest power of x is 5, so it is a polynomial of degree 5.

(ii) y3-3y is an expression having only non-negative integral powers of y. So, it is a polynomial. Also, the highest power of y is 3, so it is a polynomial of degree 3.

(iii) t2-25t+2 is an expression having only non-negative integral powers of t. So, it is a polynomial. Also, the highest power of t is 2, so it is a polynomial of degree 2.

(iv) 5z-6 is…

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