The depth of the water at the end of a pier changes periodically along with the movement of tides. On a particular dil
low tides occur at 12:00 a.m. and 3:30 p.m., with a depth of 3.25 meters, while high tides occur at 7:45 a.m. and 11:
p.m., with a depth of 8.75 meters. Which of the following equations models d, the depth of the water in meters, as a
function of time, t, in hours? Let t=0 be 12:00 a.m.
Od--3.7
-3.75cos
+5
O d--3.75cos
+5
Od--2.75cos +6
O d--2.75 cos()+6
I