Answers edited by Luke H.

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• During the first month after the opening of a new shopping home, sales were $72 million. Each subsequent month, sales declined by the same fraction. If the sales during the third month after the opening totaled $18 million, what is that fraction?
  
• How do you solve and write the following in interval notation: t is at least 10 and at most 22?
  
• Question #7621c
  
• How much volume would 2.00 moles of gas take up, under standard temperature and pressure conditions?
  
• How did the ozone layer form?