0
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Pick the closest whole number to 8.6 that is not a fraction. In this case it is 9.
10000000
9000
100
It is 0 0.00005
The answer is 400 but these websites on related links are good.
Round 12 to 1 significant figure is 10.
It is 0.01
7000
0.9
0.1
2,000,000
12
800
200