∠A and ​ ∠B ​ are vertical angles with  m∠A=x and  m∠B=4x−30 . What is m∠A ? Enter your answer in the box.

First off, if they’re vertical angles, they have to be congruent. So set the equation up as x=4x-30. Then solve and get the answer of x=10. Therefore your angle measure is 10 degrees