The position of a mass that is oscillating in SHM on a frictionless surface is given by $x(t)=(8\mathrm{.}32cm)sin[(3\mathrm{.}24ra\frac{d}{s})t]$ At what time $t>0$ is the mass first located at $x=-2\mathrm{.}91cm?$

Also, after solved find the displacement of the mass between

t$=0\mathrm{.}5$s and t$=1\mathrm{.}5$s