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Solving, and other... Please help ??

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1) 
 
   ln ( 3X^2 ) =8 
 
    3 X^2 = e^8
 
      X = √( e^8 /3) = 31.5
 
2 ) 6000 ( 1/2) ^ t/15 = 1000
 
      (1/2) ^ t/15 = 1/6
 
     t/15 ( log 1 - log 2) = log 1 - log 6
 
    t /15 ( - log 2) = - log 6
 
    t/15 = log6/ log2 = 2.585
 
    t = 15 * 2.585 = 38.77