Average of 18,40,x = 25

Which of the following transformations does not preserve congruence? * 5 points a. (x, y) → (y − 3, x − 3) b. (x, y) → (x + 5, y − 1) c. (x, y) → (y + 9, −x + 2) d. (x, y) → (3x + 1, 3y − 2)

Iam so stuck. what is the worked out answer for this question?

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9