Find the unit rate of 780miles in 3 days

The graph shown is the graph of which function?

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics

Use circumcenter theorem to solve for the given values