An observer counts 4 complete water waves passing by the end of a dock every 10. seconds. what is the frequency of the waves?

frequency = 0.4 Hz

Explanation:
1- getting the period:
The period is defined as the time taken for one complete wave to pass. We are given that 4 complete waves pass in 10 seconds.
This means that:
4 waves > 10 sec
1 wave > ?? sec
period = 10/4 seconds = 2.5 seconds

2- getting the frequency:
frequency is the inverse of the period.
This means that:
frequency = 1/period = 1/2.5 = 0.4 Hz

Hope this helps :)

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Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.