A truck has 561 apples on it. It makes a delivery of 241 apples to the farmer's market. The rest of the apples on the truck are delivered to the grocery store. How many more apples were
delivered to the grocery store than to the farmer's market?

"image"

step-by-step explanation:

in most of these problems, the notation is that the point with a "prime" is the image of the point without. that is, b' is the image of b.

here, there is no dilation or reflection. there is simply translation (with no direction shown). which figure you call the "preimage" and which one you call the "image" is up to you. as a matter of convention, the naming is as described above.