For items 4 to 8, let f(x) = -2r³ + 6x + 4. 7. Which of the following is the point of inflection of the graph of f? а. (-2,2) с. (0,4) b. (-1,3) d. (1,5) 8. Which of the following intervals show a downward concavity for the graph of f? а. (-3, -1) с. (-1,1) b. (-2,0) d. (0,2)

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