Using proportions, it is found that the expression that represents the number of reams of paper the company produced during the second year is:
[tex]4.704 \times 10^{10}[/tex]
What is a proportion?
A proportion is a fraction of a total amount.
In the first year, the company produced [tex]8.4 \times 10^9[/tex] reams, and in the second year, 5.6 times that, that is, we multiply the amount by 5.6, hence:
[tex]5.6 \times 8.4 \times 10^9 = 47.04 \times 10^9 = 4.704 \times 10^{10}[/tex]
Which is the desired expression.
More can be learned about proportions at https://brainly.com/question/24372153