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11 November, 12:43

How many times smaller is 4 * 10-9 than 8 * 10-7? A. 200 B. 20 C. 20,000 D. 2,000

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  1. 11 November, 13:17
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    17

    Step-by-step explanation:

    4*10-9 = 4

    8*10-7=21

    21-4=17
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