Hi, could anybody help me with this math question? thank you!

(a). Maximum = 3.66m   and   Mimimum = 2.76m

(b). At 16.1913 sec, the wave reaches again at 3.5m

These are the final answers.

Step-by-step explanation:

(a). From the given function, the amplitude |A| = 0.45 and vertical shift = 3.21.

Adding and subtracting the amplitude from the vertical shift will give us the maximum and minimum depth of water.

(b). Putting the values in the equation, we have:

Let's say, x is the time after 16 seconds at which the waves reaches the 3.5 again. So, we have:  

Using,

Solving for x, will give:

, putting for the first time after 16, will get us:

sec

So, seconds

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there are no multiple choices