Wylie climbs steadily down a trail that is 1,500 feet above sea level for 40 minutes. Then he takes a 10-minute lunch break. After lunch, Wylie climbs back up the trail for 5 minutes to take a picture. Finally, he hikes for 15 minutes until he reaches sea level. Which graph best represents this description?

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

Acylinder has volume 45π and radius 3. what is it’s height?

This is so hard and it’s for a test