Given:
[tex]\begin{gathered} \text{Number of music CDs sold in 2003 = 1.5 }\times10^5 \\ \text{Number of music CDs sold in 2013 = 7.1 }\times10^7 \end{gathered}[/tex]Solution
The difference between the number of CDs sold between 2003 and 2103:
[tex]\text{Difference = Number of CDs in 2013 - Number of CDs in 2003}[/tex]Substituting, we have:
[tex]\begin{gathered} \text{Difference = 7.1 }\times10^7\text{ - 1.5 }\times10^5 \\ =\text{ 7.1 }\times10^2\text{ }\times10^5\text{ - 1.5 }\times10^5 \\ =10^5(710-1.5) \\ =\text{ 708.5 }\times10^5 \\ =\text{ 7.085 }\times10^7 \end{gathered}[/tex]Answer: 7.085 x 10^7
