A wave is modeled with the function

y$($x$,$ t$)=(0\mathrm{.}20$ m$)$sin$$

$0\mathrm{.}90$ m$1$ x $0\mathrm{.}60$ s$1$ t $+$

$4$

$.$

Find the following.

$($a$)$

amplitude $($in m$)$

$($b$)$

wave number $($in m$1)$

$($c$)$

angular frequency $($in s$1)$