Final answer:
The scale factor used in the drawing is 2, which means that every inch on the scale drawing represents 2 feet in real life.
Step-by-step explanation:
To determine the scale factor, we can set up a proportion using the width of the scale drawing and the actual width of the sandbox. Let's call the scale factor x:
4.5 inches (scale drawing) / x = 9 feet (actual sandbox) / 1
Cross-multiplying, we get:
4.5x = 9
Dividing both sides of the equation by 4.5, we find:
x = 9 / 4.5 = 2
Therefore, the scale factor used in the drawing is 2. This means that every inch on the scale drawing represents 2 feet in real life.