Posted by anonymous on Wednesday, September 6, 2006 at 8:37am.
Estimate the number of breaths taken during 70 years, the average life span of a person.
Estimate the number of times your heart beats in an average day.
And your thinking is...?
We will be happy to critique your thinking or work.

estimate  rosa, Monday, February 14, 2011 at 8:10am
4 x 10^8 breaths
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