3. [-/1 Points] DETAILS SCALCET9 1.3.029.EP. Suppose the water depth during low tide at a certain bay is about 4.0 m, and at high tide it is about 10,0 m. The natural period of oscillation is about 12 hours, and on a particular day, high tide occurred at 6:45 a.m. Find the amplitude (in meters) of the model. m Find the period (in hours) of the model. If the model is a cosine function, it is translated 6.75 units -Select-- o and 7 units -Select- ). Find a function involving the cosine function that models the water depth D(t) (in meters) as a function of time t (in hours after midnight) on that day. D(t) = Need Help? Read It 4. [-/1 Points] DETAILS SCALCET9 1.3.036. MY NOTES ASK YOUR TEACHER PRACTICE ANC Consider the following ((x ) = -, 9(x) = 3x+8 (a) Find the function f . g. (f . g) (x ) = Find the domain of the function. (Enter your answer using interval notation.) (b) Find the function g . f. (9 . n(x) = Find the domain of the function. (Enter your answer using interval notation.) (c) Find the function f . f. (f . D) ( x ) = Find the domain of the function. (Enter your answer using interval notation.) (d) Find the function g . g. (9 . 9)(x) = Find the domain of the function. (Enter your answer using interval notation.)