Correct Answer: A
Explanation:
This question is trying to put a mathematical definition to a real life situation. First, recall the definitions of parallel and perpendicular lines, since those terms are among the answer selections.
Parallel lines: In a plane, parallel lines are lines that will never intersect. This means they have the same slope but different intercepts.
Perpendicular lines: In a plane, perpendicular lines are lines that intersect by creating a 90o angle. This also means they have opposite sign, reciprocal slopes.
Now, look at the aspects of this particular problem.
"The seat of a swing on a swing set is attached to the top horizontal bar by two chains that are exactly 24 inches from each other and of equal length. The seat of the swing is also 24 inches."
The question is asking to define the relationship between the horizontal bar and the swing seat. Since the two chains are exactly 24 inches apart from one another and of equal length and attached to the pole which is horizontal from the swing and the swing seat itself is 24 inches, it is concluded that the seat and the horizontal bar are parallel to one another.