the percent L of surface light that filters down through bodies of water can be modeled by the exponential function L(x)=100e^kx where k is a measure of the murkiness of the water and x is the depth below the surface in meters.
A recreational submarine submersible is traveling in clear water with a k value of -0.02. Write and graph an equation giving the percent of surface light that filters down through clear water as a function of depth. What is L(40)?