Bobby draws an artwork measuring 2.25 inches by 2 inches. He makes a copy of the artwork, enlarging it so that its dimensions are now 3.15 inches by 2.8 inches. What scale factor did he use to create the copy of the original artwork? Write your answer as a decimal.
(1 point)
To find the scale factor, we divide the dimensions of the enlarged artwork by the dimensions of the original artwork.
The scale factor is:
\[\text{Scale Factor} = \frac{\text{Enlarged artwork dimensions}}{\text{Original artwork dimensions}}\]
For the width, the scale factor is:
\[\frac{3.15}{2.25} \approx 1.4\]
For the height, the scale factor is:
\[\frac{2.8}{2} = 1.4\]
Since the scale factors for both the width and height are the same, the overall scale factor is 1.4.
Therefore, Bobby used a scale factor of 1.4 to create the copy of the original artwork.