A wave on a string is described by

D$($x$,$t$)=(3\mathrm{.}4$cm$)$sin$[2$$($x$/(8\mathrm{.}4$m$)+$t$/(0\mathrm{.}18$s$)+1)],$ where x is in m and t is in s$.$ In what direction is this wave traveling? What is the wave speed? What is the frequency? What is the wave number? At t$=0\mathrm{.}63$s$,$ what is the displacement of the string at x$=0\mathrm{.}70$m$?$