The height of a cylinder is equal to the diameter of the base. what expression represents the volume of the cylinder, in cubic units?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

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

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?