Which of the following sets of ordered pairs (x, y) represent y as a function of x? *
O {(4,-2), (1,-1), (0,0), (4,2)}
O {(1,2), (1,3), (1,4), (1,5)}
O {(-1,1),(0,0), (1,1), (2, 2)}
O {(2.5,8), (3.5,8), (2.5, 2), (4.5, 2)}

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.

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin