Scott is walking. D(t), given below, is his distance in kilometers from Glen City after t hours of walking.
D(t) = 15.5 - 5t
Complete the following statements.
Let D^-1 be the inverse function of D. Take x to be an output of the function D.
(a) Which statement best describes D^-1(x)?
- His distance from Glen City (in kilometers) after he has walked x hours.
- The ratio of the amount of time he has walked (in hours) to his distance from Glen City (in kilometers), x.
- The reciprocal of his distance from Glen City (in kilometers) after walking x hours.
- The amount of time he has walked (in hours) when he is x kilometers from Glen City.
(b) D^-1(x) =
(c) D^-1(8.5) =