Final answer:
The decimal representation of 6.453 x 10⁵ is 645300.
Step-by-step explanation:
The decimal representation of 6.453 x 10⁵ is 645300.
When a number is written in scientific notation, like 6.453 x 10⁵, it means that we multiply the number 6.453 by 10 raised to the power of 5. In this case, 10⁵ means 10 raised to the power of 5 which is 10 × 10 × 10 × 10 × 10 = 100000.
So, multiplying 6.453 by 100000 gives us 645300. Therefore, that is the correct decimal representation of 6.453 x 10⁵.