Answer:
![scale\ factor=5](https://img.qammunity.org/2020/formulas/mathematics/middle-school/3km9dfxj83onb5lkq54j74x5eum1vdu5mn.png)
Explanation:
By definition, a Dilation is a transformation in which the image has the same shape as the pre-image but size changes.
The center of dilation is a fixed point in the plane, and the scale factor is the ratio of the corresponding sides of the image to the pre-image.
Based on the information provided in the exercise, you know that:
![UE = 2\ cm\\\\U'E'=10\ cm](https://img.qammunity.org/2020/formulas/mathematics/middle-school/m86fl60ng5n95wvsiv0ix1alcoru5ffc49.png)
Thererefore, you can determine that the scale factor is: