Tyler ate x fruit snacks, and Han 3/4 less than that

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

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).

Find the zeros of each function. f(x) = x^2 + 5x - 6