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Which is the set of numbers less than or equal to 44 or greater than 77?\newlineChoices:\newline(A)\{x | x \leq 4 \text{ or } x > 7\} \newline(B)\{x | x \leq 4 \text{ or } x < 7\} \newline(C)\{x | x < 4 \text{ or } x \geq 7\} \newline(D)\{x | x < 4 \text{ and } x \geq 7\}

Full solution

Q. Which is the set of numbers less than or equal to 44 or greater than 77?\newlineChoices:\newline(A){xx4 or x>7}\{x | x \leq 4 \text{ or } x > 7\} \newline(B){xx4 or x<7}\{x | x \leq 4 \text{ or } x < 7\} \newline(C){xx<4 or x7}\{x | x < 4 \text{ or } x \geq 7\} \newline(D){xx<4 and x7}\{x | x < 4 \text{ and } x \geq 7\}
  1. Understand the problem: Understand the problem. We need to find the set of numbers that are either less than or equal to 44 or greater than 77.
  2. Identify inequality signs: Identify the correct inequality signs for the conditions given. For numbers less than or equal to 44, we use x4x \leq 4. For numbers greater than 77, we use x > 7.
  3. Combine conditions: Combine the two conditions using the word "or" as indicated in the problem. The correct set notation will include both conditions separated by "or".
  4. Match with choices: Match the combined condition with the given choices. The correct set notation that represents the set of numbers less than or equal to 44 or greater than 77 is \{x | x \leq 4 \text{ or } x > 7\}.
  5. Verify answer: Verify the answer by checking if any other choice could potentially match the conditions. Choice (B) "{x | x \leq 4 \text{ or } x < 7}" includes numbers between 44 and 77, which is not what we want. Choice (C) "{x | x < 4 \text{ or } x \geq 7}" excludes the number 44 and includes numbers equal to 77, which is also incorrect. Choice (D) "{x | x < 4 \text{ and } x \geq 7}" is not possible because a number cannot be both less than 44 and greater than or equal to 77 at the same time.

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