Answer:
AB = 8
Explanation:
you have to set up a ratio. AE = 6 because 15-9=6. which means the ratio is 6:9. Simplify it to get 2:3. 13/3 = 4
4x2 = 8
8
AB=x
AE is 15-9=6
x/6=(12+x)/15
Multiply both sides by 30
5x=2(12+x)
5x= 24 +2x
3x=24
x=8
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