Answer:

Step-by-step explanation:
Since perimeter,
and we know that P=2(l+w) then 
The length will be 
Now 
Answer:
i think so 3/4 If i am wrong plz anyone say the correct answer
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Answer:
21
Step-by-step explanation:
e/3 = 7 you can rewrite as e/3 = 7/1 and cross multiply e*1 = 3*7 so e= 21