Harrison has 50 CDs in his music collection. If 10% of the CDs are country music and 60% are pop music, how many CDs are other types of music?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list