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

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

 3.8 x 10¹ years ago.

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Do the math. she originally had 50 dollars on her gift card and she had 12 dollars left on her gift card after she finished her shopping spree. if you subtract 50 minus 12 you get thirty eight dollars as your answer. so therefore, ciara spent 38 dollars total o