A wave on a string is described by D(x, t) = (3.0 cm) sin[2(x/(2.4 m) +

A wave on a string is described by D(x, t) = (3.0 cm) × sin[2π(x/(2.4 m) + t/(0.20 s) + 1)], where x is in m and t is in s.
a. In what direction is this wave traveling?
b. What are the wave speed, the frequency, and the wave number?
c. At t = 0.50 s, what is the displacement of the string at x = 0.20 m?