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OpenStudy (anonymous):
this equation graphs as a parabola. tell which direction the parabola opens and at what point it crosses the y-axis. y=-10x^2+9x+15
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OpenStudy (anonymous):
use the value of A to tell the direction. a = -10 so this opens down since it is negative y-int is when x = 0, so that is at y = 15
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