Use the wave equation to find the speed of a wave given by -

$\mathit{y}\mathbf{(}\mathbf{x}\mathbf{,}\mathbf{t}\mathbf{)}\mathbf{=}\mathbf{(}\mathbf{3}\mathbf{.}\mathbf{0}\mathbf{m}\mathbf{m}\mathbf{)}\mathbf{}\mathit{s}\mathit{i}\mathit{n}\mathbf{[}\mathbf{(}\mathbf{4}\mathbf{.}\mathbf{00}{\mathbf{m}}^{\mathbf{-}\mathbf{1}}\mathbf{)}\mathbf{x}\mathbf{‐}\mathbf{(}\mathbf{7}\mathbf{.}\mathbf{00}{\mathbf{s}}^{\mathbf{-}\mathbf{1}}\mathbf{)}\mathit{t}\mathbf{]}$.

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