obby 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.
To find the scale factor, we divide the dimensions of the copy by the dimensions of the original artwork.
For the width: 3.15 inches / 2.25 inches ≈ 1.4
For the height: 2.8 inches / 2 inches = 1.4
The scale factor is approximately 1.4.