Find the area of the composite figure​

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).

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

The curved part of the figure is the semicircle what is the best approximation for the area of this figure