Water Level in Cape May, NJThe plot below shows the water level in Cape May, NJ beginning at 9:00 a.m. on October 13, 2009. Try to find equations of the form f(x) = a*cos(b(x-c)) + d and f(x) = a*sin(b(x-c) +d. You can use the sliders to help you locate important points on the curve in order to find appropriate values for a, b, c, and d.
Laura Kinnel, Created with GeoGebra |