Answer:
3(6+4) ._. hope this helps
The perimeter of a rectangle is the sum of its sides, which are two widths and two lengths:

Since the length is twice the width, we have
, and the formula for the perimeter becomes

So, we have

The next the sequence is 19,23,27. it increases by 4. John is wrong
Positions of 2, 5, 17 are not changed - so its not commutative property