In a bread recipe, the amount of flour should be a non-negative rational number. Here's the analysis of each option:
- 47: This is a positive whole number and is a valid amount of flour.
- Start Fraction 4 over 7 End Fraction: This is a positive proper fraction and is also a valid amount of flour.
- square root of 3: This is an irrational number and not suitable for measuring flour in this context.
- −3: This is negative and not a valid measurement for flour.
- 2 3/4: This is a positive mixed number and is a valid amount of flour.
The numbers that could be used to specify how many cups of flour should be used in a bread recipe are 47, Start Fraction 4 over 7 End Fraction, and 2 3/4.
If you need to specify just one, then numbers like 47 or 2 3/4 are generally more practical for a recipe.