"The price of long distance phone calls goes down after 5 p.m. and falls further after 11 p.m. As a result, people make more long distance phone calls as it gets later each night." A graph showing this relationship between long distance phone rates and the number of calls made would show
A) a negatively- sloped curve.
B) an inverse relationship.
C) a positively- sloped curve.
D) Both answers A and B are correct.

Question

Quizplus · Accepted Answer

Both answers A and B are correct. As the price of long distance phone calls decreases, people tend to make more long distance phone calls. This creates an inverse relationship between the price of long distance phone calls and the number of calls made, which is represented by a negatively-sloped curve on a graph. As the price continues to decrease even further after 11 p.m., the number of phone calls made increases even more, resulting in a positively-sloped curve on the graph.

"The Price of Long Distance Phone Calls Goes Down After