Can someone help me on this algebra question

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

If there are 3.281 feet in 1 meter, how many inches are in one centimeter