Write each decimal in decimal notation 7.7 x 10 to the power of 13

Well to understand this concept you can look at 10¹ which equals 10.

 

There is 1 digit (0) behind the first digit (1).

 

So based on this logic 10¹³ would have 13 digits behind the first number and therefore, it would equal 10 000 000 000 000

 

That means 7.7 * 10¹³ would just be that number multiplied by 7.7 which would just equal 77 000 000 000 000.