Answer:

Explanation:
A trapezoid is a quadrilateral with one pair of parallel sides (known as "bases") and one pair of non-parallel sides (known as "legs").
The parallel sides of the given trapezoid are AD and BC, with the slope of AD being 1/2.
If two lines are parallel, their slopes are equal. Therefore, the slope of BC is equal to the slope of AD. So, the slope of BC is 1/2.