What is the number 6.3×10^−4 written in decimal notation
The number \( 6.3 \times 10^{-4} \) written in decimal notation is \( 0.00063 \).
Here's how it works: \( 10^{-4} \) means 1 divided by 10,000, which is 0.0001. When you multiply 6.3 by that, you move the decimal point four places to the left, giving you 0.00063.