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determine the age of a specimen given that p(t) = 70

equations is : p(t)=100(0.5)^t/5730

I found the answer using ln but I'm not supposed to use ln for some reason please help!!


I'm also suppost to say what info the inverse function provides and i have no clue 

points are :50,5730  25,11460  12.5, 17190  6.25, 22920  3.125,28650  1.5625,34380

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