If you have a geometric series in sigma notation , how do you find the common ratio without expanding the series ?

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation

Pentagon abcde is dilated according to the rule do,3(x,y) to create the image pentagon a'b'c'd'e', which is shown on the graph. what are the coordinates of point a of the pre-image? a) (-1, 1)b) (-1, 2)c) (-9, 6)d) (-9, 18)

The table below shows the angle measurements for triangle abc and triangle xyz. if triangle abc is similar to triangle xyz, what does angle z equal, in degrees?