Two more than 4 and a number plus 17 is 5

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

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.

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?