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Answer :
i) The degree of polynomial \(x^2 + x\) is 2. Hence, it is a quadratic polynomial.
ii) The degree of polynomial \(x - x^3\) is 3. Hence, it is a cubic polynomial.
iii) The degree of polynomial \(y + y^2 + 4\) is 2. Hence, it is a quadratic polynomial.
iv) The degree of polynomial \(1 + x\) is 1. Hence, it is a linear polynomial.
v) The degree of polynomial \(3t\) is 1. Hence, it is a linear polynomial.
vi) The degree of polynomial \(r^2\) is 2. Hence, it is a quadratic polynomial.
vii) The degree of polynomial \(7x^3\) is 3. Hence, it is a cubic polynomial.