A wave on a string is described by

D$($x$,$t$)=(3\mathrm{.}6$cm$)$

sin$[2$$($x$/(8\mathrm{.}4$m$)+$t$/(0\mathrm{.}20$s$)+1)],$ where x is in m and t is in s$.$

Part A

In what direction is this wave traveling?

in the positive x$-$directionin the negative x$-$directionin other direction

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Part B

What is the wave speed?

Express your answer with the appropriate units.

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v $=$

nothingnothing

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Part C

What is the frequency?

Express your answer with the appropriate units.

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f $=$

nothingnothing

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Part D

What is the wave number?

Express your answer with the appropriate units.

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k $=$

nothingnothing

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Part E

At t$=0\mathrm{.}70$s$,$ what is the displacement of the string at x$=4\mathrm{.}9$m$?$

Express your answer with the appropriate units.

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D$(4\mathrm{.}9$m$,0\mathrm{.}70$s$)=$

nothingnothing