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Answer:
9c -4d
Step-by-step explanation:
6c − 8d + 3c + 4d
Combine like terms
6c + 3c − 8d +4d
9c -4d
Answer:
Where is the quadrilateral? You haven't inserted a picture.
The vertical of x is 100 degrees meaning the opposite will be 80 degrees because they always add up to 180 degrees.