Whats 2+2 ? whats 2+2 ? whats 2+2 ? whats 2+2 ?

Need solving this second acceleration problem.

Ineed i been stuck on this question since yesterday

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.