Triangle abc has vertices a(5, 3) , b(3, 7) , and c(1, 4) . triangle abc is dilated, and the vertices of the image are a′(1.25, 0.75) , b′(0.75, 1.75) , and c′(0.25, 1) . the center of dilation is the origin. what is the scale factor of the dilation? a. 0.25 b. 0.5 c. 2 d. 4

Let's compare the two points A(5,3) and A'(1.25, 0.75)

The x coordinates of the two points are 5 and 1.25 respectively

Let k be the scale factor. We multiply the scale factor k by the x coordinate of the original point to get the x coordinate of the new point
5*k = 1.25
k = 1.25/5
k = 0.25

The scale factor is 0.25; the answer is choice A

The linear dimensions are 1/4th of the original (or 25% of the original)

Im sorry i cant answer it : ( im so sorry