Question

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 am and 12:30 pm, with a depth of 2.5 m, while high tides occur at 6:15 am and 6:45 pm, with a depth of 5.5 m. Let t = 0 be 12:00 am. Write a cosine model, d = acos(bt) + k, for the depth as a function of time. This amplitude is meters. a =

Answer 1

1.5 meters

a = -1.5

12.5 hours

b = 4 pi/25

k = 4 meters

last option is D

Explanation:

edg 23'

Answer 2

Answers:

1.5, -1.5, 12.5, 4pi/25, 4, D

Explanation: