please answer this question with process /explanation.
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Answer:
40
Step-by-step explanation:
ABD and CBD are isolaterall triangles
angle ADB=ABD=40
angle CDB=CBD=40
In triangle ADB and CBD
BAD+ADB+DBA=180
BAD=180-80
BAD=100
BDC+DCB+CBD=180
DCB=100
Y=?
DAC=180-40+90=50
Y=50
X=?
BXC=180-40-50=90
X=90
X-Y=90-50=40
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