Answer:
82
Step-by-step explanation:
180-98. it's easy.
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Answer:

Step-by-step explanation:

add
to both sides

add
to both sides

divide both sides by 


Answer:
A. 1, 5, 10, 5, 1
Step-by-step explanation:
Answer:
20 or D.
Step-by-step explanation:
You simply plug in the values given for a and b:

So, your answer is 20.
Since CB || ED and CB = ED,
by the alternate interior angles theorem,
mE = mC, and mD = mB.
with CB = ED, we can conclude that CBF = EDF, by SAS congruent theorem.