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I need help with these two questions?

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1. (3.6 X 10^7) + (1.2 X 10^7)

2. (9.7 X 10^8) - (2.8 X 10^8)

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  1. 1. (3.6 X 10^7) + (1.2 X 10^7)

    (3.6 X 10^7) = (3.6 X 10,000,000)

    (1.2 X 10^7) = (1.2 X 10,000,000)

    (3.6 X 10,000,000)  + (1.2 X 10,000,000) =

    (36,000,000) + (12,000,000) =

    **48,000,000**

    2. (9.7 X 10^8) - (2.8 X 10^8)

    (9.7 X 10^8) = (9.7 X 100,000,000)

    (2.8 X 10^8) = (2.8 X 100,000,000)

    (9.7 X 100,000,000) + (2.8 X 100,000,000) =

    (970,000,000) + (280,000,000) =

    **1,250,000,000**


  2. #1   4.8 X 10^7

    #2   6.9 X 10^8
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