Assume that the height y of the river bed above its lowest point is given by a formula of the form

f(x)=Asin(2pi/B(x-C)) + D

where x is the number of feet measured horizontally from the loewest point of the river bed. The river bed is 20 feet deep at its center and measures 40 feet across

a)Suppose that the river bed is partially filled with water. Let h be the deph of the water at the deepest point of the river (measured in feet) and let w be the width of the river. Find a formula relating h and w. Be sure to evaluate all constants in your formula.

Thanks so much for your help I'm so stumped on this one