Write the degrees of each of the following polynomials:

(i) 7x³+4x²-3x+12

(ii) 12 -x+2x³

(iii) 5y-

(iv) 7

(v) 0

Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer:

(i) 3x²-4x+15

(ii) y²+2

(iii) 3+x

(iv) x-

(v) x¹²+y³+t⁵⁰

Write the coefficient of x² in each of the following:

(i) 17 – 2x + 7x²

(ii) 9-12x+x³

(iii) x² – 3x + 4

(iv) x-7

Classify the following polynomials as linear, quadratic, cubic and biquadratic polynomials:

(i) x+x²+7y² (ii) 3x-2

(iii) 2x+x²

(iv) 3y (v) t²+1

(vi) 7t⁴+4t³+3t-2

Classify the following polynomials as polynomials in one-variable, two variable etc:

(i) x²-xy+7y² (ii) x²-2tx+7y²-x+t

(iii) t³-3t²+4t-5 (iv) xy + yz + zx