- 13 + 1 = 19
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- The interval of interest is \( (12.56, 31.4) \). We seek the whole numbers strictly greater than 12.56 and strictly less than 31.4. These numbers are:
- 13, 14, 15, \ldots, 31
- To count them, compute:
- Thus, there are \(\boxed{19}\) whole numbers in the interval.
- Question:** The average of \( 2x+7 \), \( 5x-1 \), and \( 3x+4 \) is 24. What is the value of \( x \)?
- Solution:** The average of the three expressions is given by:
