144.4 is the answer when rounded of to the nearest tenth(1/10 or 0.1)
Because angleCBD+angleBDC+angleC=180
so angleCBD+angleBDC=180-angleC=180-82=98
because BC=DC
so angleCBD=angleBDC
so 2 angleCDB=98
so angleCDB=49
so y=29
by Joy Xu,紫馨雪汐
52\10= $5.20 so that is the right answer