Question 1202181
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With the given input data, you have

    350 = 2L + 2*70.


Hence,  

    2L = 350 - 140 

    2L = 210

     L = 210/2 = 105.


<U>ANSWER</U>.  The length of this rectangular lot is 105 feet.
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Solved, with all necessary auxiliary explanations.