What scale factor was applied to the first rectangle to get the resulting image?
there's a small rectangle that says 3 over it and there's a arrow pointing to an even bigger rectangle saying 7.5

So, the arrow is telling us that we're going from the small rectangle to the big rectangle.

The 3 and the 7.5 are on the same side of the rectangle, right? So, let's try this backwards.

To get to 3 from 7.5, what do we divide by? (Hint: (7.5)/(3) Divide.)

The scale factor is the answer of the division, which is 2.5. We multiply 3 by 2.5 to get to 7.5.

Step-by-step explanation: