Questions asked by Nicki

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• When doing langrage multipliers for calculus 3... lets say i already found my critical points and i got a value from it. how do i know if it is a min or max value?
  
• Help please... when do we use substitution during limits? please give me an example
  
• I got stuck on this integral how do i take the integral on the left side?
  
• How do i multiply this ? 320.7 million x 72.36 million ? do i have to write out all the zeros?