Someone plz help plz

Let r = 3. what is the value of r + 58?

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).

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer