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7th grade math questions Scientific Notation

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19.
Write the size of a grain of very fine sand, about 9.35 x 10^-2 cm, in standard form.

31.
The population of the US is expected to be 392 million people by 2050. Write this answer in scientific notation.

37.
Write 10^29 - 10^28 in scientific notation.

Thanks!
-Delilah :)

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