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If your question refers to (a - b)6 - which would need to be written out as open bracket a minus b closed bracket to the 6th power - the answer is b6.
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-1
There are 5 common differences between seventh and twelfth terms, so the CD is 2.5/5 ie 0.5. First term is therefore 15 - 6 x 0.5 = 12.
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.
every next term is 4 smaller than previous so 7th term = -23
1 - 2 - 4 - 8 - 16 - 32 - 64 the sequence doubles