Question

http://prntscr.com/ckw5bl

Answer 1

which one do you think is right?

Answer 2

The one higlighted.

Answer 3

That's incorrect.

Answer 4

Look at this:

Answer 5

8 to 12
8(1.5) = 8 + 4 = 12.
12 to 18
12(1.5) = 12 + 6 = 18.

Answer 6

Adding 13.5 was not a pattern throughout this sequence.

Answer 7

18 to 27
18(1.5) = 18 + 9 = 27.
27(1.5) = 27 + 13.5 = 40.5

Answer 8

It was multiplying 1.5