Triangle ABC Triangle ABC ​is transformed with the center of dilation at the origin. Pre-image: △ABC with vertices A(−5, −4), B(−7, 3), C(3, −2) Image: △ A ′ B ′ C ′ with vertices A ′ (−3.75, −3), B ′ (−5.25, 2.25), C ′ (2.25, −1.5) What is the scale factor of the dilation that maps the pre-image to the image? Enter your answer in the box.