Question

How do you express this in scientific notation : 68,070,000,000,000

Answer 1

6.807 × $10^{13}$

To get this answer count the number of space you have between the first 0 to 6 and put a decimal between 6 and 8.

           68,070,000,000,000
11,12,13,10  987   654  321

You count 13 right

Answer 2

Okay at the end there will be a decimal
68,070,000,000,000.    (well it doesn't have to but anyway)
You want to move the decimal between 6 and 8 because in scientific notation the number has to be between 1 and 10

6.8070000000000 (Now count how many places it takes to get 6.8, I got 13 moves)

So now you want to make the 13 an exponent to 10. (I'm really I'm sorry, I answer this type of question before and I can't really explain it clearly but I know how O_O, anyway...)

it will be 6.807 x 10<u />¹³

I hope this help you out and sorry about me not really explaining it like you wanted to... :(