- Can someone explain me why flunitrazepam have to use HPLC chromatogram ?

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Help. Evaluate a^2+b for a=1/2 and b=-1/2
I know the answer is -1/4 but and 0.25 but why is it -1/4 should it be -1/2. Any help. Thanks? Youdrop a190.0 gram pellet of Aluminium @ 190.0deg C into a 665.0 gram vat of water intially at 17.0 deg C. What is the temp of the mixture? What s a data set containing 5 data values with a mean of 10 and a standard deviation that is not 0? How do I find the vertex of y=-x^2+4x-2? Is mica clastic organic or chemical?