Question 31270
1. h=2b+4, and A=(1/2)b.h
                =(1/2)b(2b+4)=35
               A is (b^2)+(4b)=70
                    2(b^2) + 4b -70 =0
                   =b^2 +2b -35 =0
                    (b+7)(b-5) = 0 so, b is -7 or 5 but -7 is not exist in 
                     length so we chose b=5 only.
               then, ur area 35 = (1/2)5.14 works.