If r + | r | = 0, which of the following must be true?  Choose the correct choice from the following answers.
A) r > 0  B) r≥0  C) r < 0  D) r≤0  E) r = 0
Manipulate the equations:   r + | r | = 0   |r| = -r   -r &gt; 0 OR -r = 0   This means r could be 0 or r is less than 0.   D. r≤0   E. r=0   Answer: r≤0
<result>D</result>
If r + | r | = 0, which of the following must be true?