HELPP MEE PLEASEEE 55 points

The measure is X=4

Step-by-step explanation:

you set the expressions equal to each other and find the value of X

so you have 20x+60 and 30x+20

you set them equal to each other and it looks like 20x+60=30x+20

you move the 30x to the other side by subtracting it on both sides getting

-10x + 60= 20

next you move the 60 to the other side getting -10x=-40

then you divide -10 on both sides getting x=4

140 degrees

Step-by-step explanation:

both angle 1 and angle 3 are going to be the same degrees, so you can use their equations to solve for x.

this is the equation to solve for x    --->       20x + 60 = 30x + 20

when you solve it, you will get that x = 4

then plug in 4 for x in the angle 1 equation

20x + 60   >         20(4) + 60

then you get 140, which is the answer.

18a

step-by-step explanation:

simply because it is. it's the highest common factor