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The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

If the equation of a line containing the midsegment of a triangle is y = -1/4x -11, what is the slope of the triangle side that is opposite the midsegment (the one not touching it). explain how you know.

Which graph or graphs appear to show a sinusoid? < me asap !