Answer:4Step-by-step explanation:To find the Greatest Common Factor (GCF) of 28, 92, and 56, we need to determine the common factors of these numbers.Factors of 28: 1, 2, 4, 7, 14, 28Factors of 92: 1, 2, 4, 23, 46, 92Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56The common factors are 1, 2, and 4. The greatest of these is 4.So, the GCF of 28, 92, and 56 is 4