The correct option is: D) [tex]1.035 \times 10^1^1[/tex]
Explanation
Number of mails delivered in the month of December [tex]=7.14 \times 10^1^0[/tex]
and number of mails delivered in the month of January [tex]= 3.21\times 10^1^0[/tex]
For finding the total number of mails delivered for these two months, we need to add [tex]7.14 \times 10^1^0[/tex] and [tex] 3.21\times 10^1^0[/tex]
[tex](7.14 \times 10^1^0)+(3.21\times 10^1^0)\\ \\ = (7.14+3.21)\times 10^1^0\\ \\ = 10.35\times 10^1^0\\ \\ =\frac{10.35}{10}\times 10^1^1 = 1.035 \times 10^1^1[/tex]
So, the total mail delivered for these two months is [tex]1.035 \times 10^1^1[/tex]
