Answer:
x = 15
Step-by-step explanation:
the figure has one pair of parallel sides and is therefore a trapezoid.
the lower base angle is supplementary to the upper base angle on the same side, then
8x + 6 + 54 = 180
8x + 60 = 180 ( subtract 60 from both sides )
8x = 120 ( divide both sides by 8 )
x = 15
