Before sunrise, the temperature was 22.4°F below zero. By noon, it had risen 12.8°F. What expression can be used to find the temperature at noon?

A temperature 22.4°F below zero is written as −22.4°F. Since it rose by 12.8°F, add 12.8 to the starting temperature: −22.4 + 12.8. Therefore, choice B, “−22.4 + 12.8,” gives the temperature at noon.

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