Which set of ordered pairs does not represent a function?

a)
(0, 1), (2, 2), (4, 8), (-2, 7), (5, 8)

b)
(0, 1), (2, 2), (4, 8), (2, 7), (5, 8), (7, 9)

c)
(-3, 6), (2, 7), (0, 5), (1, 5), (4, 9), (5, 4)

d)
(-4, 2), (-3, 2), (-2, 2), (-1, 2), (0, 2), (1, 2)

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126

What is the interquartile range (iqr) of the data set represented by this box plot?