A sinusoidal wave traveling in the -x direction (to the left) has an amplitude of 20.0 cm, a wavelength of 35.0 cm and a frequency of 12.0 Hz. The transverse position of an element of the medium at t = 0, x = 0 is y = -3.00 cm and the element has a positive velocity here. (a) Sketch the wave at t = 0. (b) Find the angular wave number, period, angular frequency and wave speed of the wave. (c) Write an expression for the wave function y(x,t).