To specify how many cups of flour should be used in a bread recipe, the number must be a non-negative and typically a rational number. Let's evaluate the options:
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−3: This is negative and cannot represent a quantity of flour. Not valid.
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square root of 3: This is a positive number (approximately 1.732) but is not a whole number or a common fraction for a recipe. However, it can technically represent a quantity. Valid but unconventional.
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234: This is a positive whole number and can represent the amount of flour needed. Valid.
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2 Start Fraction 3 over 4 End Fraction: This notation seems to indicate 2.75 (or 2 and 3/4), which is also a positive quantity representing a reasonable amount of flour in a recipe. Valid.
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47: This is also a positive whole number and can represent the amount of flour needed. Valid.
In summary, the valid options for specifying how many cups of flour should be used in a bread recipe are:
- square root of 3
- 234
- 2 Start Fraction 3 over 4 End Fraction
- 47