84, if you fit the quadratic rule Un= 32n2- 144n + 148 for n = 1, 2, 3, ...
Or
-1.33... if you fit the power rule Un= -108/(-3)nfor n = 1, 2, 3, ...
There are infinitely more options. Give me any fourth number and I will find you a term to value rule that will work for that value.
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36
If the first term is 12 and the seventh term is 36, then we have gone up 36-12 in the space of 6 term changes. This is 24 per 6 changes, which can be written as the division 24/6. This works out as 4. Thus the common difference in the sequence is 4.
12
36
The lowest term of 36 and 3 is: 3 as 36 goes into 3, 12 times and 3 goes into three once.