7. Consider two sinusoidal sine waves traveling along a string modeled as y x,t =0.40 cm sin (3m-]-2s 't) and yx ,t = 0.40cm sin (3m-1-25-it+. a) What is the height of the resultant wave formed by the interference of the two waves at the position x = 1.0 m at time t = 3.0 s? b) A 2-m long string is stretched between two supports with a tension that produces a wave speed equal to Vw = 35 m/'s. What are the wavelength and frequency of the first three modes that resonate on the string