Answer:
Angle ACE=80º
Step-by-step explanation:
Since the angles ACD and ACE are supplementary (meaning they form a straight line or 180º when added up) we know that the sum of those angles is 180º.
If ACD + ACE = 180 and ACD =100
then, 100 + ACE =180 and by subtracting we find that ∠ACE=80º.
