The linear density of a string is $1\mathrm{.}910-4$kgm$.$A transverse wave on the string is described by the equation y$=(0\mathrm{.}035$m$)$sin$[(2\mathrm{.}1$m$-1)$x$+(28$s$-1)$t$]$

What are $($a$)$the wave speed and $($b$)$the tension in the string?

$($a$)$Number