Which relation is a function?

{(9, –1), (–1, 9), (9, 2), (2, –1)}

{(5, –7), (4, 6), (–3, 8), (5, 9)}

{(8, –4), (–4, 8), (–4, –8), (–8, 4)}

{(2, 3), (–2, 3), (3, 2), (–3, –2)}

The spotter on the ground is standing beneath the safety net. what is his distance from the base of the platform, to the nearest meter? 3 meters, 2 meters, 4 meters, 1 meter?

The number of hours per week that the television is turned on is determined for each family in a sample. the mean of the data is 37 hours and the median is 33.2 hours. twenty-four of the families in the sample turned on the television for 22 hours or less for the week. the 13th percentile of the data is 22 hours. approximately how many families are in the sample? round your answer to the nearest integer.

John read the first 114 pages of a novel, which was 3 pages less than 1/3 of the novel. write an equation to determine the total number of pages (p)(p) in the novel.