not sure if a 4 on a WSQ needs to be resubmitted, so just playing it safe.
Unit I, Concept 1
The exponential yak died expression means that the asymptote is y=k with no restrictions in the domain.
One way to find if there is not an x-intercept is to set y=0, and if it becomes undefined that means that there is none. Also you can just look at the graph.
To correctly write the range of the graph you use exponential notation, negative infinity to the asymptote.
We can tell when the graph is below when a is negative; the graph will be on top if a is positive.
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