64
If you mean: 1, 2, 4, 8 and 16 then the next number is 32
128-256
32
32
You are multiplying each number in the sequence by -2. Therefore, the next number in the sequence after 32 is -64.
(4x2)=8,(8x2)=16,(16x2)=32
256 is the next number, 3+5=8. 3+5+8=16. 3+5+8+16=32. and so on.
It is 128 because they are doubled up each time
-64
16*3 = 48
32