For keeping business records, every three months of a year is called a quarter. how many months are equal to three quarters of a year? explain how you found your answer.

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

What numbers are included in the set of integers? what numbers are not included?

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