Answer: The correct option is (a). 840.
Step-by-step explanation: We are given to select the number that is equivalent to the following decimal number :
[tex]N=8.4\times 10^2.[/tex]
We know that
10 to the power positive number n means there are n zeroes after the digit 1.
Therefore, for the given decimal number, we get
[tex]N=8.4\times 10^2=8.4\times100=84\times10=840.[/tex]
Thus, the required same number is 840.
Option (a) is CORRECT.
