Dilation involves changing the size of a line segment
The scale factor is 2
From the question (see attachment), we have the following side lengths
[tex]AQ = 1.25[/tex]
[tex]A'Q' = 1.25 + 1.25[/tex]
[tex]A'Q' = 2.5[/tex]
So, the scale factor (k) from AB to A'B' is calculated using the following scale factor formula
[tex]k = \frac{A'Q'}{AQ}[/tex]
This gives
[tex]k = \frac{2.5}{1.25}[/tex]
Divide 2.5 by 1.25
[tex]k = 2[/tex]
Hence, the scale factor is 2
Read more about dilations at:
https://brainly.com/question/3457976