Tuesday morning the temperature was -4°F. The temperature rose 5°F by lunchtime and dropped 30°F by midnight. What is the temperature in Seattle at midnight?

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Okay, to start off using a number line is always useful. Negative 4 plus 5 equals 1, if it dropped by 30 which is subtracting 30 from 1 it takes 1 out of the positive zone to the negative. Which equals to negative 29.
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