Is this a function???

Name the quadrilaterals that have four equal sides.

Can (3,5 and square root 34) be sides on a right triangle?

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