Let be a periodic function whose values are given below. Find the period, amplitude, and midline.
x
8
23
38
53
68
83
98
113
128
f(x)
10
8
-4
10
8
-4
10
8
-4
(a) The period of the graph is
help (numbers)
(b) The midline of the graph is
help (numbers)
(c) The amplitude of the graph is
help (numbers)