A wave on a string is described by

D$($x$,$t$)=(2\mathrm{.}4$cm$)$D$($x$,$t$)=(2\mathrm{.}4$cm$)$

sin$[2$$($x$/(7\mathrm{.}2$m$)+$t$/(0\mathrm{.}18$s$)+1)]$sin$[2$$($x$/(7\mathrm{.}2$m$)+$t$/(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$=0\mathrm{.}63$st$=0\mathrm{.}63$s$,$ what is the displacement of the string at x$=7\mathrm{.}8$m$?$