Awnser and show your work plz

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

Which of the following describes the symmetry of the graph of y = x3?

Plz ( true - false) all triangles have interior angles whose measure sum to 90.