X is 10.5 because each side is the same and the other side is 42. So 42 divided by four is 10.5. Hope this helps!
Bill has 12 cards. I figured this out by making a table and drawing an equation:
When the first number increases by one the second number is added by 4's. So from the first part to the second it added 4 then from the 2nd to the 3rd it skips adding 8 to then just add 12. Then from the 3rd to the 4th it skips adding 16 and adds 20. So the next set of numbers would be (4,64) because it skips adding the 24 and adds the 28.
Hope this helps and is not to confusing :)
--Answer--
The answer is resolved in the photo.
Regards!
I hope it
helps you :)
