Question

In Panama City in January, high tide was at midnight. The water level at high tide was 9 feet and 1 foot at low tide. Assuming the next high tide is exactly 12 hours later and that the height of the water can be modeled by a cosine curve, find an equation for water level in January for Panama City as a function of time (t).
A) f(t) = 4 cospi over 2t + 5
B) f(t) = 5 cospi over 2t + 4
C) f(t) = 5 cospi over 6t + 4
D) f(t) = 4 cospi over 6t + 5

Answer 1

C because 6t + 4. has a 5 cospi.