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MrGumby
The answer is C. 5.000039x10^6.

In order to change something into scientific notation you have to move the decimal place enough times to get the first number to be between 1 and 9. After that, you must count how many space you moved it and that is your exponent. Moving the decimal space to the left gives you a positive exponent. Moving it to the right gives you a negative exponent. 
Cathenna
Scientific notation of 5,000,039 is = 5.000039 x 10^6

When we have to write scientific notation then we have to put a point in the given number so that the number comes between 1 and 9. And after that put the power of the ten to how much point you have moved to get the resultant.

If you move a point in left side then power will be negative but if you move the point to the right side the power will be positive.

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