Determine if the expression is a polynomial or not. plz help!

Asphere has a diameter of 10 in. what is the volume of the sphere?

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

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?