In scientific notation, the radius of each bacterium in a petri dish is 3.15 × 10-7 meter. the radius of the bacterium written as a decimal number in standard form is meters?

Radius of bacterium is given as

now we know that

now using the above value

so above is the standard form of the representation.

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are there answer choices to this question? this seems like a question where you have options to choose from.