Question

A single tree produces about 2.6 × 102 lb of oxygen each year. The Amazon rainforest has about 3.9 × 1011 trees.



About how many pounds of oxygen are produced in the rainforest each day ?

Answer 1

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

Answer 2

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