# sinusoidal word problem

in tidal waves the sea level drops first leaving the seabed exposed (normally 30 feet below sea level), then it rises a equal distance above sea level. waves hitting a city have a max height of 38.9 meters. the cycle of rise and fall took between 26-35 minutes. assuming the waves follow a sine curve, with height Y varying sinusoidally with time T. -use f(t)=A sin(b(t))+k. to find a equation to represent this event. -what does A and K stand for? -how long was the seabed exposed at a period of 26 minutes? for the amplitude i got 38.9 meters-(-30ft)/2= 24.022 meters. for the K value or vertical shift i got 38.9M+(-30ft)/2= 14.878meters. im not sure if the period would be 35 minutes or 35-26=9 minutes. and im not sure if there is a horizontal shift or compression and would there be any limitations?

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 You asked a similar question, math.stackexchange.com/questions/240442/… --- perhaps you can explain what parts of the answer you did or didn't understand, and what is new here? – Gerry Myerson Dec 3 '12 at 5:57 in this part i wrote out the full question without skipping any parts. and i also added what i was able to work out and if i did it correctly. if not, it would be much appreciated if someone can point me in the right direction. thank you. – kelz Dec 5 '12 at 3:54