Last year, the number of students enrolled in the school band was 50. This year, the number of students enrolled in the school band is 40. What is the percent change in the number of students enrolled in the school band from last year to this year?

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

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

Simplify the following expression 48^1/2