Use quadratic regression to find a function that fits the following
points.
(1,3), (2,-7), (-1,11)
y = [? ]x2 + [ ]x+ [ ]

What percent of the circle below is shaded?

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

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