Andy estimated that he would need 79 feet of lumber for a tree house project. he later found that the actual amount of lumber needed was 68 feet. what was the percent error of andy's estimation?

The image of abc is a'b'c. what transformations would result in this image? abc is reflected over the line x = 1, then is rotated -90° around the origin. abc is reflected over the line y = x - 1, then t: (x, y) → (x - 1, y - 1). abc is rotated 90° around the origin, then is reflected over the y-axis. abc is rotated -90° around the origin, then is reflected over the line y = -1.