To determine which of the given numbers could be used to specify how many cups of flour should be used in a bread recipe, we need to consider only positive numbers (since you cannot use a negative amount of an ingredient).
The given numbers are:
- \(\sqrt{3}\) (approximately 1.732, which is positive)
- \(2\) (a whole positive number)
- \(\frac{3}{4}\) (which is 0.75, a positive fraction)
- \(\frac{4}{7}\) (which is approximately 0.571, a positive fraction)
- \(-3\) (a negative number, which cannot be used)
Therefore, the numbers that could be used to specify how many cups of flour should be used in a bread recipe are:
- \(\sqrt{3}\)
- \(2\)
- \(\frac{3}{4}\)
- \(\frac{4}{7}\)
In summary, the valid options are: \(\sqrt{3}\), \(2\), \(\frac{3}{4}\), and \(\frac{4}{7}\).