Ineed asap this is very very important

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).

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?