First, we need to substitute 45 for x in the function r(x):
r(45) = $\frac{45}{9}+\sqrt{\frac{45}{5}}+13$
Now, we can simplify the expression:
r(45) = $5+\sqrt{9}+13$
Since the square root of 9 is 3, we can further simplify:
r(45) = $5+3+13$
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