The asymptote of the function given in the task content is the line; x = 25.
It follows from the task content that the function given is a rational function and hence, the asymptote of the function is the X-value which renders the function undefined in which case, the denominator is equal to 0.
x - 25 = 0.
x = 25.
The end behaviour of the functions graph is that it approaches the line x = 25 but never touches the line.
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