E Test: Test 4 Question 3 of 16 This test: 16 point(s) possible Submit test This question: 1 point(s) possible Let a be directly proportional to m and n2, and inversely proportional to y3. If a = 9 when m = 16, n = 9, and y = 3, find a when m = 6, n = 4, and y = 7. a = (Type an integer or a simplified fraction.)