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Use the following graph, which shows the maximum and minimum normal temperatures in January for several cities in the United States.(TABLE CAN NOT COPY)Complete the following table. In the row labeled "Expression," write a numeric expression for the difference between the maximum and minimum temperature in January for each city. In each block of the row labeled "Difference," calculate the difference between the maximum and minimum temperature in January for each city.(TABLE CAN NOT COPY)b. Which of the cities in part a had the greatest difference in maximum and minimum temperatures?

\begin{aligned}&a\\&\begin{array}{|l|c|c|c|}\hline & \text { Barrow, AK } & \text { Duluth, MN } & \text { Nashville, TN } \\\hline \text { Expression } & -8-(-20) & 18-(-1) & 46-28 \\\hline \text { Difference } & 12 & 19 & 18 \\\hline\end{array}\end{aligned}b. Duluth, MN

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all right for this one. We have to make an expression. Forgive my poor handwriting. But the difference between the high temperature in Alaska Barrow, Alaska, is negative. Eight minus and negative 20. And that's the same thing as negative eight plus 20 which ends up being a positive 12. Now for here we haven't 18 minus negative one in a similar way. When you subtract a negative, it's like saying, Plus, it's like 18 plus one, which is 19 now. Here the temperature is 46. Low temperature is 28. If I subtract those two things, I get a difference of 18 degrees, meaning to lose. Minnesota had the greatest difference in temperature.

University of Denver

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