exam Maths Puzzle Numerical Ability

Please help me solving the following

simplify

-2^-3 - 3/-3^-2 - 3^0

thank u

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exam Other Question

Factor the polynomial s^2 + 25. Ih the polynomial cannot be factored, write PRIME here are 2 expressions:-
a: x^2 + x - 3
b: y^3 - 2y + 6
substitute in these numbers to evaluate the expressions
3, -3, 0.5, 0.35