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Logarithm, SMB-021

Solve  `3^a=28`  for `a`, giving your answer correct to 2 decimal places.  (2 marks)

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`3.03`

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`3^a` `=28`  
`log_10 3^a` `=log_10 28`  
`a xx log_10 3` `=log_10 28`  
`a` `=(log_10 28)/(log_10 3)`  
  `=3.033…`  
  `=3.03`  

Filed Under: Logarithms Tagged With: num-title-ct-patha, smc-4243-70-Solve exponentials

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