The answer is very simple to get if you have a calculator. You first multiply [tex]3.6[/tex] and [tex]7.35[/tex]. You should get 26.46, now you move one decimal to the front which means you are multiplying 10 to it. Now you can refer the rest from below:
[tex]2.646 * 10^{1} * 10^{9} * 10^{5} [/tex] Add the powers of ten
[tex]2.646 * 10^{1+9+5} [/tex]
[tex]2.646 * 10^{15} [/tex] This is your answer =)
