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Mathematics, 04.07.2019 13:30 jayonelijah

(20 points) which conjunction or disjunction is equivalent to following open sentence? $|\alpha - 9|\leq 4$ a. $\alpha - 9 \geq 4$ and $\alpha - 9 \leq 4$ b. $\alpha - 9 \leq 4$ or $\alpha - 9 \geq -4$ c. $\alpha - 9 \leq 4$ and $\alpha - 9 \leq -4$ d. $\alpha - 9 \leq 4$ and $\alpha - 9 \geq -4$

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