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12 February, 22:16

Rt. 78 is approximately 8.9 x 10^3 times longer than Rt. 54. Rt. 54 is 4.5 x 10^3 miles long. How long is Rt. 78? Write your answer in scientific notation.

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  1. 13 February, 00:49
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    Rt. 78 is 4.005 x 10^7.

    Rt. 54 is 4,500 mi. long,

    Rt. 78 is 8,900 times longer,

    4,500 x 8,900 = 40,050,000 = 4.005 x 10^7
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