A and B are vertical angles. If m_A = (3x - 30)° and m
then find the value of x.
B = (2x - 9)

Work Shown:

Vertical angles are always congruent.

This means they are equal in measure.

A = B

3x-30 = 2x-9

3x-2x = -9+30

x = 21

Side note:

if x = 21, then,

A = 3*x-30 = 3*21-30 = 33 degrees

B = 2*x-9 = 2*21-9 = 33 degrees

answer: c.  

step-by-step explanation:

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step-by-step explanation: