Question: Which of the following gives the range of y = 4 - 2 -x ? (A) (- , ) (B) (- , 4) (C) [-

Which of the following gives the range of y = 4 - 2^-x?
(A) (- ∞, ∞)

(B) (- ∞, 4)

(C) [- 4, ∞)
(D) (- ∞, 4]

(E) All reals

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Calculus Graphical, Numerical, Algebraic 3rd Edition by Ross L. Finney, Franklin D. Demana, Bert K. Waits, Daniel Kennedy