If angle 1 and angle 3 are vertical, explain why it will always be true that angle 1 and angle 3 are congruent angles. Prove it without using specific measurements for the angles.

cut 138 centimeters off

step-by-step explanation:

250-112 = 138

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.