F and H are sets of real numbers defined as follows. F= {x|x4} H={x|x>8} Write FUH...

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F and H are sets of real numbers defined as follows. F= {x|x4} H={x|x>8} Write FUH and Fn H using interval notation. If the set is empty, write . F and H are sets of real numbers defined as follows. F= {x|x4} H={x|x>8} Write FUH and Fn H using interval notation. If the set is empty, write .