Question

1. what is pr? points a, b, c, and d on the figure below are collinear. use the figure for exercises 8 and 9.

Explanation:

Step1: Since A, B, C, D are collinear

We know that \(AB + BC=AC\) and \(AC + CD = AD\). Also, assume \(PR\) is related to the lengths on this line - segment. Let's find the length of \(AD\) in terms of \(x\). \(AD=AB + BC+CD=x + 3x+(4x - 13)\).
\[AD=x + 3x+4x-13=8x - 13\]
However, if we assume we want to find the length of \(AC\) (maybe \(PR\) is a mis - label and we mean \(AC\)), then \(AC=AB + BC\).

Step2: Calculate \(AC\)

\[AC=x + 3x=4x\]

Answer:

If \(PR\) means \(AC\), then the length is \(4x\). If more information about what \(PR\) represents relative to the given line - segment is provided, a more accurate answer can be given.