On each of maggie's bird-watching trips, she has seen at least 24 birds. if she has taken 4 0f these trips each year over the past 16 years, at least how many birds has maggie seen

Let m ♣ n be defined as follows: m ♣ n = m^3 - n^3 if x ♣ y = 0, which statement could be true? a) x = 0, y = 1 b) x = 2, y = 2 c) x = -1, y = 0 d) x = -3, y = 3 e) x = 1/2, y = -2