-30 is the answer to your problem.
Answer:
The slope of AB is different from the slope of BC is NOT TRUE.
Step-by-step explanation:
AB and BC are on the same straight line, so their slopes are the same.
Use trigonometry to find L.
Tangent = opposite over adjacent on any right triangle.
tan(L) = 18/23
Take the inverse on both sides.
arctan(tan(L)) = arctan(18/23)
L = 38.0470425318
L = 38.05°
Done.
