exam Maths Puzzle Numerical Ability

P(x)=x^4-4x^3-4x^2-4x-5 it aks me to find all rational zeros of the polynomial. but i dont really know what te rational numbers are

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exam Other Question

some bacteria were in the microscope and doubles its size every six minutes. in 2 hours the slide is fully covered. when was it half covered? 21. Which of the following is not an expression?
A) p(t + 7)
B) p + ÷ t
C) t•p - 7
D) t + p + 9
Thanks for all you do!!!!!!