Hi

  4^2 = x+9 , x = 7

   x^2 = 64, x = 8

    2^x = 8  , 2^x = 2^3,  x = 3

 , 5^(x/4) = 125, 5^(x/4) = 5^3 , x/4 = 3, x = 12

   

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