I need help I don’t understand it

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

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).

Which of the following transformations will always produce a congruent figure?