Pre algebra

Which of the following is greater than 4.3 × 10^9
A. 2.1 × 109
B. 3.2 ×109
C. 5.3 × 109
D. 7.4 ×108
I think it's either C or D, but I can only choose one.

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  1. well, D is 0.74 x 10^9
    so I guess C, eh?

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  2. D is 7.4 x 10^8

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  3. A. 2.1 × 10^9
    B. 3.2 ×10^9
    C. 5.3 × 10^9
    D. 7.4 ×10^8

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  4. The ratio of the correct number to 4.3*10^9 is greater than 1:
    n/4.3*10^9 > 1. So the answer is C.

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