Simplify this expression: 13 + (–12) – (–5) = ?  
            a.  –30    b.  6    c.  30    d.  –6 

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.