book Maths Puzzle Numerical Ability

please help me solve this inequality: (x+2)(x-1)(x-3)<= 0

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book Other Question

how long would it take to travel 150 miles at 90 miles per hour Fixed operating costs at a ball bearing plant is $2000 per day. Each worker created $500 worth of ball bearings in a day, but costs the company $300 per day in wages and benefit.