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.