The equation of a transverse wave on a string is y=(2.0mm)sin[(20m−1)x−(600s−1)t]

The equation of a transverse wave on a string is y=(2.0mm)sin[(20m−1)x−(600s−1)t]. The tension in the string is 15 N.
(a) What is the wave speed?
(b) Find the linear density of this string in grams per meter.