Answer:
(0, ∞)
Explanation:
The range of a function is the vertical extent of its graph. An exponential function has a horizontal asymptote at y=0, and extends to infinity.
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The range of the function ...
f(x) = 11·(1/3)^x
is from 0 to infinity, not including either value:
range: 0 < y < ∞, or (0, ∞)