Part A: Explain how to sketch the graph of a curve that opens downwards and has only one -intercept at (2.5,0). Part B: Explain how to sketch the graph of a curve that opens upwards where the minimum value of the graph is (0,1).

Part C: Explain how to sketch the graph of a curve with the following characteristics.
The graph opens downward.
The y-intercept is (0,6).
The x-intercepts are(-1,0) and (3,0) .
The maximum value of the function is located at the point (1,8).