The horizontal asymptote of an exponential decay function typically indicates where the function approaches as the x-values increase towards infinity. This value is usually found by examining the behavior of the function as \(x\) increases.
In most cases for exponential decay functions, the horizontal asymptote is a constant value, often represented by \(y = k\), where \(k\) is the value the function approaches. In many exponential decay graphs, this constant is often zero, implying that the function approaches the x-axis but never actually reaches it.
If the graph you are examining doesn't provide explicit coordinates for the horizontal asymptote, a common assumption in general exponential decay is:
The horizontal asymptote is at \(y = 0\).
You would fill in the answer as:
The horizontal asymptote is at \(y = 0\).