Hose R can fill an empty pool in 4/5 the time that hose S can empty a full pool. If they are both used at the same time with an empty pool, the pool will be filled in 20 hours. What is the rate of each?

Ineed with number 17 i don’t get it at alll

In two or more complete sentences describe how to determine the appropriate model for the set of data, (1,1), (3,2), (6,3), (11,4).

Agroup of randomly selected apple valley high school students were asked to pick their favorite gym class. the table below shows the results of the survey. there are 528 students at apple valley high school. gym class number of students racquet sports 1 team sports 9 track and field 17 bowling 13 based on the data, what is the most reasonable estimate for the number of students at apple valley high school whose favorite gym class is bowling? choose 1 answer a. 9 b. 13 c. 119 d. 172