Statistics- which condition for constructing a t interval have been met

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

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What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1