- Where can i insert parentheses to do this problem? 4+6-3/7=1?

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Difference between perpendicular bisector and median? Help me to solve this function please..? Tri ABC with vertices A(-2.1), B(-2,5) & C(2,4) is similar to triMNO with vertices M(3,-1) &N(3,-9). Find 4 possibile coordinates of vertex? List three mole ratios and explain how you would use them in stoichiometric calculations?
SiO2+4HF===> SiF4+2H2O? If I know the standard deviation, mean and individual score, how many standard deviations is the individual score from the mean?