7, 2, -1, -2, -1 the next number in the sequence is 2.
A constant difference of -5 is applied at each step with multiples of 2 increasing by 1 at each step being added.
7 - 5 + 0x2 = 2
2 - 5 + 1x2 = -1
-1 -5 + 2x2 = -2
-2 -5 + 3x2 = -1
-1 -5 + 4x2 = 2
2 - 5 + 5x2 = 7
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1+1=2 : 1+2=3 : 2+3=5 : 3+5=8Therefore the next number is 8
16
21
Consecutive terms in the sequence are being divided by -2. Therefore, -1 / -2 = 1/2 or 0.5.
21. Add the last 2 numbers to get the next.