How do you find the value of the expression arccos (-0.7)?

${134}^{\circ} 43 , {225}^{\circ} 57$
cos x = - 0.7 --> arc $x = {134}^{\circ} 43$
$x = - {134}^{\circ} 43$, or $x = 360 - 134.43 = {225}^{\circ} 57$ (co-terminal)