I really don't understand this on so can somebody pls help me pls

first: 140

second: 9

third: 19

Step-by-step explanation:

the first question is x=140 because they are opposite angles.

second is also opposite so 4x=36, x=9

third is also opposite so 4x+5=81, 4x=81-5, x=19

Yes, your proof is correct;

However, you should supply the REASONS

angle 2 + angle 3 + angle 4 = 180 < GIVEN

angle 1 + angle 2 = 180 <--- given

angle 1 + angle 2 = angle 2 + angle 3 + angle 4  <--- substitution/ transitive

angle1 + angle 2 - angle 2 = angle 2 + angle 3 + angle 4 - angle 2 <--- subtracts angle 2 from both side

angle 1 = angle 3 + angle 4