Respuesta :

Answer:

5 i think

Step-by-step explanation:

Answer:

the common difference is 1.5.

Step-by-step explanation:

3 + 1.5 is 4.5. if you keep adding 1.5 to each number, you'll see the pattern. alternatively, you can do 10.5 - 9, and then 9 - 7.5. for both answers, you'll get 1.5.