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Ainat [17]
3 years ago
7

Quadrilateral ABCD is a parallelogram. What is the length of AD?

Mathematics
1 answer:
matrenka [14]3 years ago
6 0

Answer:

-5

Step-by-step explanation:

ab = dc

x+15= 3x+25

2x = -10

x = -5

substituting in ad and bc

-10+18 = 8

3-(-5)=3+5=8

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