Question

A single tree produces about 2.6 x 10^2 lb of oxygen each year.The Amazon rainforest has about 3.9 x 10^11 trees.About how many pounds of oxygen are produced in the rainforest each year?

Answer 1

So to multiply standard form we multiply the 2 numbers and the 2 indices separately.

$2.6*3.9=10.14$
$x^{2} * x^{11} = x^{13}$

So we've got $10.14*10^{13}$
However Standard form must be $1 \leq x \leq 10$ therefore we need to divide that by 10 but to get the same number we add one onto the power of 10.

So the answer is:

$1.014*10^{14}$ lbs of oxygen are produced in the rainforest each year.