THIS USER ASKED 👇

What is the measure of ac? enter your answer in the box. ° do not answer for points. if so, you will be reported and points be taken back.

THIS IS THE BEST ANSWER 👇

3x – 1.5 = 1/2 (3x + 9)
2 (3x – 1.5) = 3x + 9
6x – 3 = 3x + 9
3x = 12
x = 4

AC arc = 3 (4) + 9 = 12 + 9 = 21

answer
21