Which graph is an example of a cubic function?

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie