I forgot how do to this and need someone to explain it to me.

i tested 132 degrees first bc it seemed reasonable. I did supplementary angles and if angle ACD is 132 then angle ACB had to be 48. because 180-132= 48. Then I added angle a and c together which was 98. And since there are 180 degrees in a triangle I knew that angle b had to be 82 (180-98). Then I solved for x for angle B.

4x+2-2= 82-2

4x=80

4x/4=80/x

x=20

I substitued 20 into 6x+12 later and it was 132, which works. So angle ACD is 132

Step-by-step explanation:

4x and 6y

im not sure though

the first one, all those points on the line just make a strait line.