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solong [7]
1 year ago
14

ZA and ZB are supplementary angles. If mA = (2x − 9)º and m

Mathematics
1 answer:
Papessa [141]1 year ago
6 0

angle A = 30

(2x-9) = (2x+21)
     +9          +9
 2x=2x+30

-2x  -2x

=30

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