Evaluate and interpret a restricted rational model
A rational model describes signal level in terms of distance
In this situation, a signal level falls as distance from a source increases
Let \(x\) be distance, measured in metres, and let \(y\) be signal level, measured in units
The practical input condition is \(x\in[0,\infty)\)
\[y=65+\frac{576}{\left(x+3\right)^2}\]
What value does the model give when x=5?