An object moves along the $x-$axis with its position $x,$ in meters, given as a function of time $t,$ in seconds, by

$x(t)=1\mathrm{.}49t^2-9\mathrm{.}49t+4\mathrm{.}68$

What is the object's velocity at time $t=1\mathrm{.}79s?$

$v(1\mathrm{.}79s)=$