19. (X+5)-3
20. 2a
21.3b
22. 5y-5
23. 1/2n-15
I believe the answer is $48 because 6 * 2 is 12 and 12 * 2 is 24 and 24 * 2 is 48, thus 48$. Please feel free to check my work, though.
Answer:
By power of a point, AC⋅CB=DC⋅CE. That is, 12⋅12=6⋅(2R–6).
Then, R=15.
Answer: they are different numbers
Step-by-step explanation:
