Four spheres of radius 6 cm just fit inside a cylinder. Calculate the volume inside the cylinder that is empty.
Leave your answer in terms of pi

In the 30-60-90 triangle below side s has a length of and side r has a length

Ten times the square of a non-zero number is eqaul to ninety times the number

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