The depth of water at the end of Frank's dock varies throughout the day, due to the ti...

The depth of water at the end of Frank's dock varies throughout the day, due to the tides. The following chart shows the depth measurements y, in feet, taken at specific times t

a. Use sine regression to find a sinusoidal function to model this data.

b. Use this model to find the depth at 5 a.m. and 4 p.m.

c. Frank's boat needs a minimum depth of 5 feet of water to bring his boat in to dock. Will he be able to bring his boat in to dock at 9 p.m.?