Compound inequalities are used to group at least two inequalities
The open sentence that could result in the solution set is r<6 or r>4
From the question, we understand that the solution set consists of real numbers
From the list of options, only the open sentence r<6 or r>4 satisfy the given condition.
This is so because;
r<6 or r>4 = {4.0...... to 5.99...}
The solution set of other open sentence are not true
Hence, the open sentence that could result in the solution set is r<6 or r>4
Read more about compound inequalities at:
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