1) To write any number from a Standard Notation into a Scientific Notation we're going to need to rewrite that number as a product of one number and a power whose base is ten.
2) In this case, we can see that there are 6 zeroes after the 78. So we can write down the following:
[tex]78000000=7.8\times10^7[/tex]Note that, as we wrote it with one decimal place. We can count seven decimal places.