What does 9e+10 mean?

9e +10  => 9 is the first whole value number
=> Where e stands for the number of zeroes next to 9
=> where +10 means that there are positive (whole numbers) 10 zeroes next to 9
Therefore, 9e +10
=> 90 000 000 000
There are 10 zeroes next to 9

Notes: if in the given situation shown (-) , Means, it’s a decimal number
          But if it shows (+), it’s a whole number.