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1. What happens when air is heated or cooled? ... So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.
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19 because 1 ten = 10 ones and 9 one plus 10 ones equals 19 altogether
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Bob now has 53 candy bars.
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Answer:2*2=4
4^3=4*4*4=64
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GRAPH D
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BECASUE IT IS THE WRIGHT ANSWER