Derive the equation of an ellipse (in standard form: [(x - h)^2 / a^2] + [(y - k)^2 / b^2] = 1)) that has foci at (-9,0) and (9,0) and vertices at (-15,0) and (15,0).

What properties allow transformation to be used as a problem solving tool

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

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