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) 91 1-3 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 466 472 446 441 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) 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. (Round to the nearest hundredth) 1999 41,356 2000 41,267 2001 40,833 Assuming this pattern continues, how many AIDS cases would be 2002 41,289 diagnosed in 2006? 2003 43,171