Please someone smart help please

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?

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