Final answer:
The length of segment QR is determined by subtracting the length of RS (5 units) from the length of QS (16 units), resulting in QR being 11 units long.
Step-by-step explanation:
The student's question involves finding the length of line segment QR on a straight line where point R is between points Q and S. Given that RS = 5 and QS = 16, we can find the length of QR by subtracting the length of RS from QS, since the two segments are on the same line and add up to the total length QS.
To calculate the length of QR, we use the formula:
- QR = QS - RS
- QR = 16 - 5
- QR = 11
Therefore, the length of segment QR is 11 units.