1. If f'(x) = x² sin 2x, what is the first value of x where the graph of f(x) changes concavity on the interval (0,5).
A. 0
B. 1.144
C. 1.571
D. 3.412
E. 2.290

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.