13
Starting with the number three, the pattern appears to be :-
Subtract 9 then add 2 x 9 which generates -6, 12
Subtract 8 then add 2 x 8 which generates 4, 20
So the next steps are, subtract 7 then add 2 x 7 to produce 13, 27.
14 18 20
16
Think it's 30...then 20
10
3, -6, 12, 4, 20, 13, 27, 21, 33 -9, +18, -8, +16, -7, +14, -6, +12
10
42
The sequence changes by multiplying with different numbers: from 3 to -6 (* -2), -6 to 12 (* -2), 12 to 4 (* 0.33), and 4 to 20 (* 5). If we continue this pattern, 20 multiplied by 0.5 gives us 10. So, the next number is 10.
16
14 18 20
24
The pattern goes -1 x5 so the next number is 19x5 which is 95
Think it's 30...then 20
The next figure would be 21, followed by 11 & 10.
10
20
3, -6, 12, 4, 20, 13, 27, 21, 33 -9, +18, -8, +16, -7, +14, -6, +12