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x² + 11x + 18 < 0
[-11 ± sqrt(121 - 72)]/2 = (-11 ± 7)/2
solution: (-9, -2)
step-by-step explanation:
answer: 1.06 km per sec
39.6 m=63.72 km
60 min in an hour so 63.72/60=1.06