“Man, I didn’t do nothing,” students often said to me when I spoke with them about their behavior. “My point exactly,” I replied. “If you didn’t do nothing, you must have done something.” It was after ...

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To add -4 and 5, draw the starting number on a number line and count to the right when adding positive numbers. What is the difference in temperature between a desert at 40 °C and a mountain top at -2 ...