Answer:
The scale factor is 3
Step-by-step explanation:
The scale factor of the dilation is calculated using;
[tex]k = \frac{image \: length}{corresponding \: object \: length} [/tex]
From the length of the pre-image rectangle is 3 while the corresponding image length is 9.
The scale factor
[tex] = \frac{9}{3} = 3[/tex]
Therefore the scale factor of the dilation is 3.
