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Which is the set of numbers less than 7-7 or greater than or equal to 4-4?\newlineChoices:\newline(A)\{x | x < -7 \text{ and } x \geq -4\} \newline(B)\{x | x < -7 \text{ or } x > -4\} \newline(C)\{x | x < -7 \text{ or } x \geq -4\} \newline(D)\{x | x > -7 \text{ or } x \leq -4\}

Full solution

Q. Which is the set of numbers less than 7-7 or greater than or equal to 4-4?\newlineChoices:\newline(A){xx<7 and x4}\{x | x < -7 \text{ and } x \geq -4\} \newline(B){xx<7 or x>4}\{x | x < -7 \text{ or } x > -4\} \newline(C){xx<7 or x4}\{x | x < -7 \text{ or } x \geq -4\} \newline(D){xx>7 or x4}\{x | x > -7 \text{ or } x \leq -4\}
  1. Understand the problem: Understand the problem. We need to find the set of numbers that are either less than 7-7 or greater than or equal to 4-4. This is a union of two conditions.
  2. Identify inequality signs: Identify the correct inequality signs for each condition. For numbers less than 7-7, we use the "<" sign. For numbers greater than or equal to 4-4, we use the "≥" sign.
  3. Translate into set notation: Translate the conditions into set notation. The first condition is x < -7. The second condition is x4x \geq -4. Since the problem asks for numbers that satisfy either condition, we use the word or\text{or} to combine them.
  4. Eliminate incorrect choices: Look at the choices and eliminate the incorrect ones. Choice (A) uses "and" which is not correct because we are looking for a union, not an intersection. Choice (B) has the wrong inequality for the second condition; it should be "x4x \geq -4", not "x > -4". Choice (D) has the wrong inequality for the first condition; it should be "x < -7", not "x > -7".
  5. Select correct choice: Select the correct choice. The only choice that correctly represents the union of the two conditions is (C){x | x < -7 \text{ or } x \geq -4}.

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