- PLEASE HELP!!!!!!!!!!! graph x + y=6 x -y =8?

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Parent function for y=.2(x-0)^2+2.8? David's exam score is 77. the mean is 80 and the standard deviation is 6. whats his percentile? Calculate the dilution factor if the sample volume is 30 microliter and the diluent volume is 270 microliter? If I make $315 for a whole 7 days how much money am I making an hour? Write an algebraic equation to match the graph: (the graph is not drawn to scale)?