Answer:
Cubic function
Explanation:
We know that Amanda is shipping a package which is in a cubic shape and she must know the length of the package in order to determine its shipping cost.
We are to figure out the function which should be used to find the length, given that the volume of the package is V cubic inches.
We know that the volume of a cube is given by:
![V=l^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/kxxi9lv1eddcnaloq6cim75xz8hclpvb2y.png)
where V is the volume and l is the length of the cube.
![l=V^{(1)/(3) }](https://img.qammunity.org/2020/formulas/mathematics/middle-school/twqugff0d7bnx1oyvxh2x7nfhgou07wrv2.png)
![l=\sqrt[3]{V}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/gbw55ywf7tvjuorwswcnq5yarpmhkdeq1k.png)
Therefore, a cubic function should be used.