Area of parallelogram where base b=11.2 units long and 3x-4 units high (h) =
11.2(3x-4)=33.6x-44.8 square units.
Can't find x without the actual area of the parallelogram.
Example: suppose area=56 square units, then 33.6x-44.8=56, 33.6x=100.8, x=100.8/33.6=3 units.