1, -2, -5 , -8
100, 90, 80, 70
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1, -2, -5 , -8 100, 90, 80, 70
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What are we supposed to do to the numbers? Anyway.
1.
-2 -1 = -3
-2 + -3 = -5
...
2.
100 - 90 = 10
90 - 10 = 80
...