Question 1161552
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<pre>

    (3x+2) + (4x+1) = 76/2 = 38   (half of the perimeter)


    7x + 3 = 38

    7x     = 38 - 3 = 35

     x              = 35/7 = 5 units.

    AD = 3x+2 = 3*5+2 = 17 units.      <U>ANSWER</U>
</pre>

Solved.