Answer:
x=35
Step-by-step explanation:
Given ia a trapezoid ABCD with bases AB and CD
Mid segment is LM
AB=x+8
CD =243
LM = mid segment = average of two bases
Hence
LM = [tex]\frac{x+8+243}{2} =\frac{x+251}{2}[/tex]
Equate this to given LM value
[tex]\frac{x+251}{2} =4x+3\\x+251=8x+6\\7x=245\\x=35[/tex]
Hence answer is
x=35