Remember the angle must be with the +x-axis, not any other axis. The vector is making an angle of $$150^{\circ}$$ with the +y-axis. So, it makes an angle of $$150+90=240^{\circ}$$ with the +x-axis.
What is the value of $$A_y$$, the y-component of vector A?
• $$10 \sin 150^{\circ}$$
• $$10 \cos 150^{\circ}$$
• $$10 \sin 240^{\circ}$$
• $$10 \cos 240^{\circ}$$