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Can someone please help me on how this solution gives 50?

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enter image description here

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    Where do you get stuck? – 2017-01-27
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    I get M > 43 i really dont get something – 2017-01-27
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    Hmmm, it would be best to post your work as well, then. – 2017-01-27
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    oh the photo got rotated.. tell me if this is a problem – 2017-01-27
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    At a quick glance, this looks fine. I will give it a more thorough look-over tomorrow morning. – 2017-01-27
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    I found a stupid solution, if i get the log 0,9 =0.04 rather than 0,043 then i get 50 but a) i dont know if this is correct, b) isnt that still M > 50? – 2017-01-27

0 Answers 0