Manco went scuba diving. As he dove deeper, the water pressure around him increased at a constant rate. The table compares Manco's depth (in meters) and the water pressure around him (in atmospheres).
Depth (meters) Pressure (atmospheres)
13 2.3
17 2.7
21 3.1
What is the rate of change of the water pressure?
atmospheres per meter

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.

Acircular garden with radius of 8 feet is surrounded by a circular path with a width of 3 feet. what is the approximate area of the path alone? use 3.14 for π

Solve the equation by completing the square. x^2+2x=17