The correct answer is carbon and the only element listed. Carbon Dioxide is made up of Carbon and Oxygen x2. This would be a compound. Air is made of water and another mixture of Hydrogen x2 and Oxygen.
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Answer from: Quest
total distance/total time
(85 + 82)/(5+3)
167/8
20 just over
Answer from: Quest
0.93xc=0.93x3x10^8m/s
2.54cm is 1 inch
360seconds i 1 hr
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