Let's break down the information given:
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Kendra woke up and the temperature was 9°F below 0°F. This means the temperature was: \[ -9°F \]
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Eight hours later, the temperature rose by 9°F. So, we can calculate the new temperature: \[ -9°F + 9°F = 0°F \]
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Kendra claims that the current temperature is 18°F.
Therefore, the statement that the current temperature is 18°F is false. The correct current temperature, after the rise, is 0°F.