Answer: 5.49*10^-4
Step-by-step explanation:
4.9*10^5+0.0005
=4.9 *10^5+5*10^-4
= 4.9*10^-5+50*10^-3
= (4.9+50) * 10^-5
=54.9*10^-5
= 5.49*10^-4
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