Question

The water level at a local pier rises and falls with the tide. Yesterday, the maximum depth of the water at the pier was 8 feet, and the minimum depth was 4 feet. High tide occurred at 12:00 AM and low tide occurred at 12:20 PM. Which function models the depth, in feet, of the water at the pier yesterday, as a function of time t in minutes past high tide?

Answer 1

use mathway.com

Answer 2

Assuming the high tide at 12:00 is the "start" of graph (meaning the point where x=0) then you can narrow it down to cos-something because cosine graphs have a "high point" when x=0 Sorry I could help more, hopefully that helped guide you.