For what values of $z$ is $z^2-40z+340\le 4$? Express your answer in interval notation.
Question:
For what values of $z$ is $z^2-40z+340\le 4$? Express your answer in interval notation.
Answer:
Let's think step by step.

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[12,28]
For what values of $z$ is $z^2-40z+340\le 4$? Express your answer in interval notation.
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