The sum of the first 20 terms of the series 14 × 6 + 16 × 8 + 18 × 10 + ... is:

The first term of a Geometric Progression (GP) is 8 and the common ratio is 6. Then the 4th term of the GP is ________.

The first term of a Geometric Progression (GP) is 12 and the common ratio is 7. Then the 5th term of the GP is ________.