How do you write 5.407 in standard form?

To write 5.407 in standard form, you need to express it as a number between 1 and 10 multiplied by a power of 10. In this case, 5.407 can be written as 5.407 x 10^0. This is because the decimal point is after the 5, and there are no digits to the right of the decimal point. Therefore, the standard form of 5.407 is simply 5.407 x 10^0.