Ayo cutie can u help me wit number 3 (if you can’t see it well jus zoom in)

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).

What is the ordered pair of m’ after point m (5, 6) is rotated 90° counterclockwise?

Is a square always, sometimes, or never a parallelogram