In the given figure, each box represents a function machine. A function machine illustrates what...

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In the given figure, each box represents a function machine. A function machine illustrates what it does with the input.
Which of the following statements is correct?
(1) \( z=2 x+3 \)
(2) \( z=2(x+3) \)
(3) \( z=\sqrt{2 x+3} \)
(4) \( z=\sqrt{2(x+3)} \)
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