Respuesta :

a. S

Scientific notation is used for representing very large numbers.
It is also used to represent very small numbers.

Scientific notation has three parts.
1st part - coefficient
2nd part - base of 10
3rd part - exponent

Example:  
7.1 x 10³

7.1 is the coefficient
10 is the base of 10
3 is the exponent

7.1 x 10³ is the scientific notation of 7100.