Are numbers used correctly in the following sentence?

The impact would have created four-hundred foot tidal waves across the Atlantic Ocean and powerful earthquakes.


Are numbers used correctly in the following sentence?
I'm assuming that you mean ';400 foot tidal waves'; rather than ';four


hundred-foot tidal waves.'; Use ';400'; to remove the possibility of


misinterpretation. Are numbers used correctly in the following sentence?
No dash, just four hundred





if you put the dash, it makes 4 tidal waves all 100 feet across
four hundred is correct, no dash needed
Julie is correct