I'd say no. A quadratic is not linear. It's slope is constantly changing, so there is not one proportion which can be used to predict future values.
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the graph of a quadratic function is a parabola. hope this helps xP
x2
The graph of a quadratic function is always a parabola. If you put the equation (or function) into vertex form, you can read off the coordinates of the vertex, and you know the shape and orientation (up/down) of the parabola.
No. The sine of an angle is not directly proportional to the angle. It is a function of the angle, but it is periodic, repeating every 360 degrees of the angle.
Quadratic equations are called quadratic because quadratus is Latin for "square"; in the leading term the variable is squared.