y = 20x is symmetric about the origin. (If you rotate it around the origin, it will look the same before it is rotated 360 degrees).
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If: 20x = 3.65 Then: x = 0.1825
20x=130 x=130/20 x=6.5 or 13/2
5x2 + 20x = 5x (x + 4)
It is a parabola, which passes through the origin and is symmetric about the y axis.
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