a. 4 to 1
b. In the top row, they are all even numbers, and in the bottom row, they are all odd numbers
c. they all simplify to 4:1
Step-by-step explanation:
a. When you simply 12 to 3, you get 4 to 1, and so on
b.....
c. same answer as a because they all simplify to 4:1