1) (3m-2)+2-m+3 please help algebra

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.

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?