Which sequence is modeled by the graph below? (6 points) coordinate plane showing the points 2, 8; 3, 4; 4, 2; and 5, 1 an = one half (16)n − 1 an = 4(2)n − 1 an = 16(−2)n − 1 an = 16( one half )n −

6. sarah saved $12.75 every week for a number of weeks, w. she received an additional $25 during the last week in which she saved money. write and solve an equation to find the number of weeks, w, for which sarah had saved money if she has $114.25 now.