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Which number is in scientific notation

A. 3.4 x 100^2
B. -5x10^-12***
C. 0.84x10^6
D. 7.8x10^5

3 answers

Oh sorry typo the question is which number is Written in sceintific notation
I tried a and it was wrong
Scientific notation consists of a number between 1 and 10, multiplied by a power of 10.

I see only one that fits this.
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