The picture for this question is given below.
Answer: All of them models quadratic function.
Step-by-step explanation: A quadratic function is of the form
f(x) = ax² + bx + c, with coefficient a≠0.
This function has a U-shape graphic called <u>parabola</u>. It has a <em><u>vertex</u></em>, i.e., a point where the curve changes, which is "classified" as <em><u>minimum</u></em>, if the parabola opens up; and as <em><u>maximum</u></em>, if the parabola opens down.
The y-intercepts are the points where the curve touches the y-axis and x-intercepts, if they exist, are the roots of the function.
The three pictures below shows three U-shaped curves opening down. <u>This means the three parabolas are representation of 3 different quadratic functions, with a 3 vertex points that are maximum.</u>
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