determine the following

the tide, drags on the ocean hear the shore changes throughout the day The walter depth in Feet is modeled according to the OF. Function d (+)= 35 - 28 cos 7 Where + is the time in hours, with t= 0 correspond to 12:00 go a- Determine the maximum and minimum depths at high and low tides D. determine the period of the Function d (t ) co determine the times at which you have hightides d. Find the times at which the depth OF water is 15 Feet