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11. 17, 200 written in scientific notation is 1.7 x 10^5

21. 0.00105 written in scientific notation is 1.05 x 10^-3

are these correct?

11. 1.72*10^4
10,000 is 10^4
you only have to move the decimal point 4 places to the left to get a number less than 10.

21. correct

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