how do you write 6.4 X 10 to the 3 power?

6,400. Since the power is positive, that shows that you will move the decimal point three spaces to the right.

10 ^ 3 = 1.000

6.4 * 10 ^ 3 = 6.4 * 1.000 = 6.400

To write 6.4 X 10^3, you use scientific notation. Here's how to do it:

1. Start with the number 6.4.
2. Move the decimal point to the right so that there is only one nonzero digit to the left of the decimal point. In this case, move the decimal point three places to the right, giving you 6400.
3. Write this number, followed by "X 10^3". The exponent 3 indicates that you moved the decimal point three places to the right.

So, 6.4 X 10^3 is equivalent to 6400.