Question

∠C
and ​
∠D
​ are vertical angles with 
m∠C=−2x+90
and 
m∠D=x−30
.
 
What is
m∠D
?

Answer 1

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Answer 2

m∠C=m∠Dx=−3x+804x=80x=20

m∠C=x∘=20∘