Solve this problem by writing and solving an inequality. Five more than four times a number is less than 25. What are the possible values of the number? Show your work. (4 points)

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1 answer

To solve the problem, we first need to translate the given statement into a mathematical inequality.

The statement is: "Five more than four times a number is less than 25."

  1. Identify the variable: Let's call the unknown number \( x \).

  2. Translate the statement:

    • "Four times a number" can be expressed as \( 4x \).
    • "Five more than four times a number" means we need to add 5 to \( 4x \), which is \( 4x + 5 \).
    • Finally, the phrase "is less than 25" indicates that we should set up an inequality:

    \[ 4x + 5 < 25 \]

  3. Solve the inequality:

    • Start by isolating \( x \):

    \[ 4x + 5 < 25 \]

    • Subtract 5 from both sides:

    \[ 4x < 25 - 5 \]

    \[ 4x < 20 \]

    • Next, divide both sides by 4:

    \[ x < \frac{20}{4} \]

    \[ x < 5 \]

  4. Conclusion: The solution to the inequality \( x < 5 \) means that the possible values for the number \( x \) are any real number that is less than 5.

Final answer: The possible values of the number are \( x < 5 \).