When 18 boys joined a group of y students, the ratio of boys to girls in the group became 4: 5. write an algebraic expression for the number of girls in terms of y.

(60 points) explain this in detail

The table showed price paid per concert ticket on a popular online auction site. what was the average price paid per ticket

Aresearch study is done to find the average age of all u.s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample