The depth of water 
at my favorite surfing spot varies from 5 to 15 feet, depending on the time. Last Sunday high tide occurred at 5:00 A.M. and the next high tide occurred at 6:30 P.M. Use a sine function to model to the depth of water as a function of time t in hours since midnight in Sunday morning.
What will be an ideal response?
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Where 
, the slope of the line through the points (
) and (
) is
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Solve the equation.(y - 6) - (y + 2) = 7y
A. - 2
B. - 
C. - 
D. - 
Solve the problem.The shape and density of a thin shell are indicated below. Find the coordinates of the center of mass.Shell: portion of the sphere x2 + y2 + z2 = 64 that lies in the first octantDensity: constant
A. 
B. 
C. 
D. 
Solve the problem.Find the height of the cliff. Round to the nearest hundredth of a meter when appropriate. 
A. 33.54 m B. 51.31 m C. 15 m D. 32.63 m