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1- Which expression is equivalent to |a|≤3 ?


a ≤ –3 or a ≥ 3


a ≥ –3 or a ≤ 3


a ≤ –3 and a ≥ 3


a ≥ –3 and a ≤ 3

2- Which expression is equivalent to |b|>7 ?


b > –7 or b –7 and b 7


b 7

3- Solve the equation. |k + 7| = 3


{–10, –4}


{all real numbers greater than or equal to –10 and less than or equal to – 4}


{–4, 4}


{–4, 10}

4- Solve the inequality. 3 + |t + 4| 3 or t 11


–11 < t < 3