A wave on a string is described by

D$($x$,$t$)=(4\mathrm{.}0$cm$)$D$($x$,$t$)=(4\mathrm{.}0$cm$)$sin$[2$$($x$/(8\mathrm{.}4$m$)+$t$/(0\mathrm{.}12$s$)+1)]$sin$[2$$($x$/(8\mathrm{.}4$m$)+$t$/(0\mathrm{.}12$s$)+1)],$ where x is in m and t is in s$.$

Part A

In what direction is this wave traveling?

Part B

What is the wave speed?

Part C

What is the wave frequency?

Part D

What is the wave number?

Part E

At t$=0\mathrm{.}24$s$,$ what is the displacement of the string at x$=9\mathrm{.}1$m$?$