To find the scale factor k, we need to calculate the ratio between the image and the preimage.
scale factor=image length/preimage length
The image is what we have after the dilation. In this case, the image is the smaller side of the enlarged copy with a length of 10inches. The preimage, which in this case is the paper of the original notes, has a dimension of 8.5inches by 11inches. To calculate k, we can substitute either pair of the corresponding sides. Since we know the shorter sides of both images, let's use them.
