Two in-phase loudspeakers are located at (x, y) coordinates (–3.0 m, +2.0 m) and (–3.0 m, –2.0 m). They emit identical sound waves with a 2.0 m wavelength and amplitude a. Determine the amplitude of the sound at the five positions on the y-axis (x = 0) with y = 0.0 m, 0.5 m, 1.0 m, 1.5 m, and 2.0 m.