If you read 12 in 1/4 hour what is the unit rate

The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

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