Here are the solutions for each sequence:

1. 100, 98, 96, 94, ___
   This sequence decreases by 2.
   Next number: 92.

2. 12, 13, 15, 18, 22, ___
   The differences are 1, 2, 3, 4 (increasing by 1 each time).
   Next difference: 5.
   Next number: 27.

3. 7, 20, 47, 94, 167, ___
   The pattern is that each term can be expressed as $n \times 2 + 1$:

   • $7 \times 2 + 6 = 20$
   • $20 \times 2 + 7 = 47$
   • $47 \times 2 + 0 = 94$
   • $94 \times 2 - 21 = 167$
     Next number: 274.

4. 1, 4, 2, 8, 6, 24, 22, ___
   The pattern alternates:

   • Multiply by 4 and