Question

What is 1500000000000 in scientific notation

Answer 1

1.5*10^12 bexause the decimal needs to travel 12 spaces right from 1.5

Answer 2

1500000000000 in scientific notation is 
1.5 * 10^12
That is because you move the decimal point 12 places to the left for it to become 1.5.
1.5 * 10^12
move the decimal point 12 places to the right and you got the original number, 1500000000000.

Hope this helps!