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Answer:
Bob must use $4,000 newspaper ads in two numbers
Explanation:
As given in the question -
Total number of people affected by $5,000 TV ad
Total number of people affected by two $5,000 TV ad
Total number of people affected by $5,000 TV ad 
Total number of people affected by two $5,000 TV ad 
Hence, more number of people are affected by two news paper adds of $4,000
Answer:
In my opinion they can be a big problem because if you can not use the uber in some community it's useless but they are banning ubers because the taxis business are loosing money and the uber is replacing the taxi business.
There is an own opinion question, so try to answer by yourself