-2(1 x 4-2 ➗ 2)+(6+2-3)
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The quadratic equation that best represents his model of the relationship between stock value and time is given by:
The graph is given at the end of the answer.
<h3>What is the equation of a parabola given it’s vertex?</h3>The equation of a quadratic function, of vertex (h,k), is given by:
In which a is the leading coefficient.
In this problem, the maximum value was a share value of $18 after 10 days, hence the vertex is:
(h,k) = (10,18).
Thus:
Since the initial price was of $8 per share, we have that:
Hence the equation is:
At the end of the answer, the sketch of the graph is given.
More can be learned about quadratic equations at brainly.com/question/24737967
