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#### Guest

##### Guest

1) the water depth in a harber is 21m at hight tide, and 11m at low tide. One cycle is completed approximatly every 12h.

a) find an equation for the water depth as a function of the time, t hours, after low tide

b) Draw a graph 48h after low tide, witch occured at 14:00

y=asink(x-c)+d

Amplitude

a=21-11/2

a=5

K

p=2pi/k

12=2pi/k

k=2pi/12

k=pi/6

what about the c and the d??

and does anyone know of anygood software to graph trig functions?

Thanks