9d + 2d + 3d – 4 = 5d

d= 4/9

Step-by-step explanation:

combine like terms 14d- 4=5d

move the 5d over by subtracting it from both sides 9d-4=0

move the for over by adding it to both sides 9d=4

divide both sides by 9 to get d by itself d=4/9

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer

stops on an even number.