Tori is comparing two cell phone plans that both have unlimited calls but different price points for text messages. Plan A is a $ 5 flat fee plus an additional 10¢ per text. Plan B, on the other hand, is a $10 flat fee plus an additional 5¢ per text. Which set of equations can be used to find when Plan B would start becoming cheaper?

Create a question with this scenario you could ask that could be answered only by graphing or using logarithm. david estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x.