- Deduce the valency of the element 9A.?

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Find the equation of the line that passes though (1,8). And is parallel to y=3x-4? Can i donate plasma if i was shot ? What percentage of total losses are core losses in a transformer? Find the directional derivative of f(x,y) = x/y at the point (2, -4)? Find the maximum rate of change of f(x,y,z) = x + y/z at the point (-2, 3, 2) and the direction in which it occurs.?