they are the same so set them equal
3x-10=2x+40 now combine like terms
3x-2x=40+10
x=50
SORRY FOR CUTTING AND HANDWRITING
HOPE THIS WILL HELP YOU
X=Since you have an angle, a hypotenuse, and the opposite side, we can use:
sin(x)=opposite/hypotenuse
sin(60)=x/8 (cross multiply)
sin(60)*8=x
√3/2*8=x
x=8√3/2
x=4√3 so the answer is B
Hope this helps