1 Number of Local Extrema Graph the polynomial, and determine how many local maxima and minima it has. 68. y = 1.2x + 3.75x - 7x' - 15x? + 18r 69. y = (x – 2) + 32 70. y = (x² – 2)' 71. y = x* - 3x + x 72. y = tx - 17x + 7

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