Answer:
Step-by-step explanation:
1) midpoint ½(14 + 4) = 9 ft
2) amplitude 14 - 9 = 5 ft
3) 10 hrs from high to low tide so last low tide 20 hrs before 3.00 PM or 7:00 PM yesterday. Obviously this is not an earth based tidal system where high to low tide takes 6 hrs. 12.5 minutes.
4) period 20 hrs
5) h = 5ft sin(2πt/20) where t is in hours, and the sine is in radians
6) h = 5ft cos(2πt/20) where t is in hours, and the sine is in radians
If one wanted the two equations to reference graphs with exactly the same time stamp, one would have to add or subtract a phase angle of π/2 inside the parenthesis depending on which plot was deemed primary.
