Suppose that in January 2013, there were 5000 radio stations in the US that played Justin Bieber's music, and that In July 2013, there were only 4000 radio stations in the US that played Justin Bieber's music.
Assuming that the rate of decline is proportional to the number of radio stations which play Justin Bieber's music, when would there only be 2000 radio stations which play Justin Bieber's music?
Image credit: Wikipedia
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
Your answer seems reasonable.
Find out if you're right!