Question

Which of the following is the same as 8.4 × 102 ? a. 840 b. 84 c. 8,400 d. .84

Answer 1

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 :

$N=8.4\times 10^2.$

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

$N=8.4\times 10^2=8.4\times100=84\times10=840.$

Thus, the required same number is 840.

Option (a) is CORRECT.

Answer 2

Move the decimal 2 places to the right

8.4 becomes 840