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Hi, is it better to do precipitation tests first or do flame tests first? I'm guessing that it would be better to do precipitation tests first then check with flame tests if suitable, since the flame test for Iron nitrate and Lead nitrate are toxic, however I just want to check. also, how do you...

Hi! Does anyone know how to do this question? A parabola with vertical axis has its vertex at the origin. Find the equation of the parabola if the line 12x − 4y + 3 = 0 is a tangent. Answer: y = -3(x^2) cambridge 9B q.12b Any help would be much appreciated!