Write $x<-5$ or $x>4$ using set notation and the union or intersection symbol.

A) $\{x\mid x<4\}\cup \{x\mid x>-5\}$
B) $\{x\mid x<-5\}\cup \{x\mid x<4\}$
C) $\{x\mid x<-5\}\cup \{x\mid x>4\}$
D) $\{x\mid x\le -5\}\cup \{x\mid x>4\}$
E) $\{x\mid x<-5\}\cap \{x\mid x>4\}$

The inequality x < -5 represents all real numbers less than -5, and the inequality x > 4 represents all real numbers greater than 4. The union of these two sets includes all real numbers that satisfy either inequality, which is exactly what choice C represents. None of the other choices include all values that satisfy the given inequality.