Respuesta :

 2,000,000 = 2.2 x 10^ 6 

2 = 2.2 x 10 ^ 0 
20 = 2.2 x 10 ^ 1 
200 = 2.2 x 10 ^ 2 

it basically shows you how many 0's you have. 

20,000 = 1.0 x 10 ^ 4 

2,000,000,000 = 1.0 x 10 ^ 9