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I will give you a explanation about how I got the answer!
Plus, I'm am so sorry if I answer this so long...
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Current year is 2016
born year is 1977
old
2016 - 1977
39 years
Answer:
option D. 4.7 x 10-4 m
Step-by-step explanation:
<u><em>The correct question is</em></u>
• cell P: 5.0 x 10-4 meters
• cell Q: 3.0 x 10-5 meters
we have
The diameter of cell P is 
The diameter of cell Q is 
Rewrite the diameter of cell P as

Find the difference

Rewrite the difference as
