Hello There!
-3 1 4 9 13.
+4 +4 +4 +4
As you can see above, to get from one number to the next it is simply adding 4. So the formula is simply just x + 4.
Hope This Helps You!
<span>Good Luck :) </span>
<span>- Hannah ❤</span>
Start with

Multiply both sides by 3:

Recall that 21/5=4.2 to claim the correct answer.
Answer:
2.9
hope this helps
have a good day :)
Step-by-step explanation: