He claims that the two farms are similar because farm A can be mapped onto farm B through the translation (x x+6,; y y+4) and a dilation about the center by a scale factor of k. What is the value of k ?

Answer:
k = 4/7
Explanation:
The radius of farm A is 7 units and the radius of farm B is 4 units. Then, the scale factor can be calculated as the ratio between the radius, so the scale factor from farm A to farm B is 4/7
Therefore, k = 4/7