Answers edited by Sarthak Mahajan

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• Which neurotransmitter(s) is/are involved in mood fluctuations?
  
• How do you evaluate #-42+ ( - 62) + 15#?
  
• Question #49b61
  
• What causes veins to collapse when an IV is administered?
  
• What is the final price of an item that costs $72.50 with a sales tax of 8%?