Suppose thath the length of time between consecutive high tides is approx. 12.5 hours. According to the national oceanic atmospheric
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Hey mate
Tides are at 12.5 hour interval
High tide 3:32 AM (3.5333 hours)
Low tide 9:47 AM (9.7833 hours)
(a)
Next high tide = 3.5333 + 12.5
= 16.0333
= 16h + 0.0333*60
= 16h02
= 4:02 PM
(b)
y = A*sin(Ω*x - Φ) + B
A = 8.8 - (-0.8) = 9.6
Ω = 2π/12.5 = 0.16π
Φ = (3.5333 + 9.7833)/2 - 12.5/2 = 0.4083
B = [8.8 - (-0.8)]/2 + (-0.8) = 4
(d)
y = 4.8sin[(0.16π)*16.0333 - 0.4083] + 4
= 8.70
hope it helps you
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