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

the correct answer is 45x

9×5=45 then add the x

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation: