Classify the following polynomials as linear, quadratic and cubic polynomials:
`2x^2 +3x +1`

Classify the following polynomials as linear, quadratic and cubic polynomials: a^2

Classify the following polynomials as linear, quadratic and cubic polynomials: 5p

Classify the following polynomials as linear, quadratic and cubic polynomials: 3r^3

Classify the following polynomial as linear, quadratic and cubic polynomial. 2x^2+3x+1, a^2

Classify the following polynomials as linear, quadratic and cubic polynomials: \sqrt{2} y -1/2

Classify the following polynomials as linear, quadratic and cubic polynomials: m^3 +7m^2 +5/2 m -\sqrt{7}