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xeze [42]
3 years ago
10

Brainliest to the first person and the steps!

Mathematics
1 answer:
Serhud [2]3 years ago
7 0

Answer:

13

Step-by-step explanation:

FC + CB = 1/2 CD + 1/2 AB = 1/4 DE + 1/2 AB

= 1/4 * 12 + 1/2 * 20 = 3 + 10 = 13

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