Functional equations are equations where the unknowns are the functions. Rather than solving for x, you solve for the function in questions like "Find all functions that have these properties."

Define the function \( f^1(x) = \frac{1}{1-x} \), and \( f^n (x) = f^1 ( f^{n-1} (x) ) \) for positive integers \(n \).

Evaluate \( f^{36} ( 10 ) . \)

Find all functions \( f: \mathbb{R} \rightarrow \mathbb{R} \) such that

\( 5 f( x + y) + y^ 5 = f(x) + (x+y) ^ 5. \)

Suppose that function \(f\) satisfies

\[f\left(\frac{x+y}{2}\right)=\frac{f(x)+f(y)}{2} \text{ and } f(0)=17.\]

Which of the following represents the family of solutions for \( f(x) \)?

\(k\) in the choices below is a constant.

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