If the difference between a number and 21 is divided by2, the result is 4 times the number. what is the number

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

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

What is 6/10 rounded to the nearest half