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29 June, 19:25

The last time the lower 48 states saw a total solar eclipse was 1979. how many years ago was that in scientific notation?

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  1. 29 June, 19:33
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    The last time (before August 21, 2017) when the lower 48 states saw a total solar eclipse was 1979.

    That was 2017 - 1979 = 38 years ago.

    In scientific notation,

    38 = 3.8 x 10¹

    Answer: 3.8 x 10¹ years ago.
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