The depth of the water at the end of a pier changes periodically along with the movement of tides. On a particular day, low tides occur at 12:00 a.m. and 3:30 p.m., with a depth of 3 point 2 5 meters, while high tides occur at 7:45 a.m. and 11:15 p.m., with a depth of 8 point 7 5 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 is equal to 0 be 12:00 a.m.
Answer
A
d is equal to negative 2 point 7 5 cosine open paren 4 pi over 31 t close paren plus 6
B
d is equal to negative 3 point 7 5 cosine open paren 4 pi over 31 t close paren plus 5
C
d is equal to negative 2 point 7 5 cosine open paren 4 pi over 29 t close paren plus 6
D
d is equal to negative 3 point 7 5 cosine open paren 4 pi over 29 t close paren plus 5