In Exercises 85–88, find the vertex for each parabola. Then determine a reasonable viewing rectangle on your graphing utility and use it to graph the quadratic function. 85. y = -0.25x² + 40x 86. y = -4x? + 20x + 160 87. y = 5x² + 40x + 600 88. y = 0.01x² + 0.6x + 100

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Q: when is the vertex of a parabola the minimun point? When is it the maximum point

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A: Concept:The connecting points in the graph is called vertex. Given:

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A: Solution is given below:

Q: 10 Write the equation of the parabola that has "a" value -1 and vertex (-2, 5) ?/1

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Q: In Exercises 18 and 19, use a gr parabola. Identify the vertex and = x 18. 1

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Q: 8. Find the best parabola to fit the data points: (-1, –1), (0, 1), (1,0), (2, 3).

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Q: Write an equation in vertex form of the parabola that has the same as the graph of(x) = 4x² or g(x)…

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