Not sure how to do this problem. that is x^3 btw

Use sigma notation to represent the following series for 9 terms.

Which term describes the point where the perpendicular bisectors of the three sides of a triangle intersect?

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.