Find P(X > 4, Y > 4) and P(X ≤

Find P(X > 4, Y > 4) and P(X ≤ 1, Y ≤ 1) if (X, Y) has the density f(x, y) = 1/32 if x ≥ 0, y ≥ 0, x + y ≤ 8.