Answers

2014-09-26T02:50:01+05:30
A single tree produces about 2.6*102lb of oxygen each year.
and the amazon rainforests has about 3.9*1011 trees.
oxygen produced=2.68102*3.9*1011
10.452*1013
1.0452*1014

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2014-09-26T10:10:06+05:30
A single tree produces oxygen in 1 year = 2.6×10² lb
so 3.9*  10^{11} trees produces oxygen in 1 year(365 days) = 2.6* 10^{2} *3.9* 10^{11}  lb
therefore 3.9* 10^{11} trees produces oxygen in 1 day =  \frac{2.6* 10^{2}*3.9* 10^{11}  }{365} =27.8* 10^{9} lb
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