5 you add them all up and then divide by how many number you added
(6+3+2+1+9+9) and then divide by 6
L = w - 20
12000 = w × ( w - 20 )
12000 = w^2 - 20w
w^2 - 20w - 12000 = 0
( w - 10 ) ( w - 10 ) = 0
width = 10
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Answer:
the explanation is in the picture
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