book Maths Puzzle Numerical Ability

I am having some difficulty with this problem...
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List all of the potential rational zeros of the polynomial function.Do not attempt to find the zeros. f(x)

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book Other Question

12n=12 Tyrin can paint a house in 4 days. Tahjai can paint the same house in 5 days. How many days will it take to paint the house if they work together?

I have 2.22 days