A used book store started selling CDs and videos. In the first week, the bookstore started selling 40 CDs and videos. They charged $4 per CD and $6 per video. The total sales was $180. Which system of equations corresponds to this situation?

Select the number of ways in which a line and a circle can intersect

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.

Joanie watched 1 out of three of a movie in the morning