Question 331955
Scientific notation is most effective when used with a. very small numbers, b. Very large numbers, c. Imaginary numbers or d. very large and very small numbers.
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There's no connection between SN and imaginary numbers, but if the number is large or small, it can be used, eg, 5*10^9i is better than 5000000000i.
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SN is convenient when dealing with large and small numbers.  There's no variation in how "effective" it is, tho.  It's a matter of convience only.
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The expected "correct" answer is 
d. very large and very small numbers.