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Let

f(x) = x^2 - 4 if x < 7

f(x) = x + 13 if x >= 7

What is f(f(f(17)))?

 Jun 10, 2021
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$f(17) = 17 + 13 = 30$

$f(30) = 30 + 13 = 43$

$f(43) = 43 + 13 = \boxed{56}$

 Jun 10, 2021

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