20. The graph of y against x where y=4+3x -x2
                    A. Cuts the y-axis at the point(4. 0)                         B. is symmetrical about the line x = 3/2
                    C. has a minimum value of 25/4                           D. cuts the x-axis at the point (1, 0)
correct answer:
B. is symmetrical about the line x = 3/2
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