AIR MATH

Math Question

Consider \( U=\{x \mid x \) is a negative real number \( \} \). Which is an empty set? \( \{x \mid x \in U \) and \( x \) has a negative cube root \( \} \) \( \{x \mid x \in U \) and \( x \) has a negative square root \( \} \) \( \{x \mid x \in U \) and \( x \) is equal to the product of a positive number and \( -1\} \) \( \{x \mid x \in U \) and \( x \) is equal to the sum of one negative and one positive number \( \} \)

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