pls help me answer this question, include part a part b and part c !

Show your work or explain #12 here to get full credit. An albatross is floating on top of the ocean in a periodic manner. The time between maximum heights is 20 seconds, and the average height of the seabird is 6 feet. The bird moves in a manner such that the distance from the highest and lowest point is 10 feet. A cosine function can model the movement of the albatross in relation to the height. Part A: Determine the amplitude and period of the function that could model the height of the bird as a function of time, t. (6 points) Part B: Assuming that a t=0, the bird is at its average height and moves upwards after, what is the cosine function that could represent the situation? (8 points) Part C: Based on the graph of the function after how many seconds will it reach its lowest height? (6 points)