Classify the following as linear, quadratic and cubic polynomials:
 
(i) \(x^2+x\) is a
 
(ii) \(x-x^3\) is a
 
(iii) \(y+y^2+4\) is a
 
(iv) \(3t\) is a
Answer variants:
linear polynomial
constant polynomial
cubic polynomial
quadratic polynomial