Write a quadratic function in vertex form whose graph has the given information. 6) vertex: (-4, 2) 7) vertex: (3, -2) point: (-3, -1 ) point: (7, 6) Write a quadratic function for the parabola shown. 8) 9) (-3 0) 10) The Algebra 2 teachers are selling pocket protectors to X 2.25 2.75 3.15 3.20 high school students. The table shows data from the last four years for the price charged for a pocket protector, x, y 466 172 446 441 and the total revenue earned for selling them. y. a) Write a quadratic model for the data. (Round to the nearest hundredth) b) How much would they expect to earn if they charged $3.00? 1 1) The table below lists the total estimated numbers of AIDS cases, by year of diagnosis from 1999 to 2003 in the United States (Source: US Dept. of Health and Human Services, Centers for Disease Control and Prevention, HIV/ AIDS Surveillance, 2003.) Let x represent the number of years since 1999, Year AIDS Cases a) Write a quadratic model for the data. (Found to the nearest hundredth) 1999 41,356 2000 41,267 2001 40,833 b ) Assuming this pattern continues, how many AIDS cases would be 2002 41,289 diagnosed in 2006? 2003 43,171