Look at quadrilateral pqrs and its scaled image p'q'r's'. what scale factor was used for the scaled image? explain how you determined this.

The scale factor would be 2.5. Since the triangles are similar, you can use the Proportionality Theorem to find that 15/6 = 2.5, 10/4 = 2.5, and 20/8 = 2.5. Since the proportions are equal, the scale factor would be 2.5. More specifically, it's a reduction of 2.5. 

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The correct answer is: b