Question

Tanya walked for 17 minutes from her home to a friend that lives 1.5 kilometers away. d(t) models Tanya's remaining distance to walk (in kilometers), t minutes since she left home. Which number type is more appropriate for the domain of d? Choose 1 answer:

A Integers
B Real numbers​

Answer 1

Answer: The function d(t) represents the remaining distance Tanya has to walk (in kilometers) at time t minutes since she left home. Since Tanya can walk any fraction of a kilometer, it makes sense to use real numbers as the domain of d(t).

Therefore, the more appropriate number type for the domain of d is B) Real numbers.

Explanation: