Question

∠A

and ​
∠B
​ are vertical angles with 
m∠A=x
and 
m∠B=4x−30
.
What is
m∠A
?

Answer 1

Angle A would be anything that Angle B is. If the angles are vertical then they are always congruent.

Answer 2

m∠A =
`(b)/(4)` + 30