To specify how many cups of flour should be used in a bread recipe, the number must be a non-negative quantity.
Let's analyze the options:
- 234 - This is a positive whole number. This is a valid option.
- \(2 \frac{3}{4}\) - This is a mixed number, which can be expressed as a positive fraction (2.75). This is a valid option.
- \(\sqrt{3}\) - This is a positive number (approximately 1.732). This is a valid option.
- −3 - This is a negative number. This is NOT a valid option.
- 47 - This is a positive whole number. This is a valid option.
The numbers that could specify how many cups of flour should be used in a bread recipe are:
- 234
- \(2 \frac{3}{4}\)
- \(\sqrt{3}\)
- 47
The only invalid number is −3.