Free point for free in this

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

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).