Answer:The common factors of 14, 21, 28, and 35 are 1 and 7. [4] To find the common factors, we need to identify the numbers that divide evenly into all four numbers. Here's how to find them: 1. List the factors of each number: - Factors of 14: 1, 2, 7, 14- Factors of 21: 1, 3, 7, 21- Factors of 28: 1, 2, 4, 7, 14, 28- Factors of 35: 1, 5, 7, 352. Identify the common factors: - The numbers that appear in all four lists are 1 and 7. Therefore, the common factors of 14, 21, 28, and 35 are 1 and 7.