Answer:
4.06 *10^-2
Explanation:
I feel like you just want a quick answer so I won't waste my time here-but just in case someone wants to get a scientific notation refresher, comment and I'll add on to this area if I see it!
the decimal number 0.0406 written in scientific notation is 4.06 × 10-2 and it has 3 significant figures
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