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9-29.

Each of the following pictures shows how the same function machine changes the given ‑value into a corresponding -value. What is the equation for this machine?

Function Machine. Input: 10, Rule: f of x. Output: 99.

Function Machine. Input: 2, Rule: f of x. Output: 3.

Function Machine. Input: negative 3, Rule: f of x. Output: 8.

Function Machine. Input: 0, Rule: f of x. Output: negative 1.

Copy and complete the table for the function.