As arousal increases, so does quality of performance--up to a point. There appears to be an optimal level of arousal, after which more arousal leads to poorer performance. This describes a relationship.

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. create a question you could ask that could be answered only by graphing or using a logarithm.