<PRE><B>Question 175909</B>
I had this one on my Final Exam. It was EXACTLY the same. =) See if this makes sense to you;

Statements-
1. Segment MP is congruent to segment QS; Segment NP is congruent to segment QR.
2. MN + NP = MP
     QR + RS  = QS
3. MN + QR = MP
     NP + RS  = QS
4. Seg. MN is congruent to seg. RS

Reasons-
1. Given
2. Segment Addition Postulate
3. Substitution
4. Substitution

Good Luck! Hope I helped!</PRE>