Answer:
a) (0, ∞)
b) (-∞, ∞)
c) x = 0
Explanation:
It helps to have some idea what the log function is.
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a) The domain is all positive numbers: (0, ∞).
b) The range is all real numbers: (-∞, ∞). (The vertical translation downward by 5 units does not change that.)
c) There is a vertical asymptote where the argument of the log function is zero: at x=0.