Mr. Hartzel had 12 books in his home library. He bought 9 new books at the bookstore, then he sold 6 books. How many books does Mr. Hartzel have now?

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?

What is the ratio of the length of an object in yards to the length of the same object in miles?

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.