Force vec$(F)=(1\mathrm{.}29N)hat(i)-(1\mathrm{.}71N)hat(k)$ acts on a pebble with position vector vec$(r)=(9\mathrm{.}06m)hat(j)-(5\mathrm{.}38m)hat(k),$ relative to the origin. What is the resulting torque acting on the pebble about $($a$)$ the origin and $($b$)$ a point with coordinates $(6\mathrm{.}38m,0,-1\mathrm{.}50m)?$

$($a$)$ Number

$($b$)$ Number