Answers edited by Meowing Cat

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• Your bank account has a balance of $45.24. This is 51.35 more than yesterday. What was your account balance yesterday?
  
• Supphurus acid is a weak acid,what will happen if it is concentrated?give reason?
  
• How do you multiply #\sqrt { 2} \cdot - 3\sqrt { 3}#?
  
• How do you convert 7/12 into a decimal and percent?