If the sea level decreases leaving the seabed exposed (normally $30$ feet below sea level), then it rises a equal distance above sea level. waves have a maximum height of $38.9$ meters. the cycle of rise and fall took between $26$-$35$ minutes. assuming the waves follow a sine curve, (height $Y$ of the wave varies sinusoidally with time $t$)
- use $f(t)=A\sin b(t)+k$ to find a an equation that fits best
- what does $A, b$ and $K$ stand for?
- how long was the seabed exposed at the shortest period of 26 minutes?