book Maths Puzzle Numerical Ability

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

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i need help!

1) Use the arithmetic sequence of numbers 1, 3, 5, 7, 9,�to find the following:
a) What is d, the difference between any 2 terms?
Answer:
Show work in this s Please help me with this! Determine the quadratic equation for the parabola:
Minimum value is 4 when x=3
zeros of f: one is 6