C(t) = (t - 6)(t + 1)(t - 7)
C- intercept when t = 0
C(0) = (0 - 6)(0 + 1)(0 - 7)
C(0) = (-6)(+1)(-7)
C(0) = 42
C-intercept = 42
t-intercepts
t - 6 = 0
t = 6
t + 1 = 0
t = -1
t - 7 = 0
t = 7
t - intercepts = 6, -1, 7
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