The distance from Earth to the moon is 384,400 kilometers. What is this distance expressed in scientific notation?

3.844x10 (with an exponent of) 5

For scientific notation, N has to be greater than or equal to 1, and less than 10. So start at the right and move the decimal over until you accomplish this.

N = the number of places you have moved the decimal.

Therefore your answer should be 3.84 x 10^8.