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Anonymous
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4x10
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40000 = 4*104
I would write it as 2.5*10-5 inches.
10% of 40000 is 4000, so 4000 + 40000 = 44000
1 with 40000 zeroes after it.
3 x 10^3 +1 x 10^1 +8
There are 400 hundreds in 40000.