In ABC, AB = CB, mABC = 4x – 3, and mCAB = x – 3. What is mACB? (1 point) Responses 28.5° 28.5° 31.5° 31.5° 63° 63° 34.5°
To find mACB, we can use the fact that the angles in a triangle add up to 180°.
We have mABC = 4x - 3 and mCAB = x - 3.
So, mACB = 180 - (mABC + mCAB) = 180 - (4x - 3 + x - 3) = 180 - 5x + 6 = 186 - 5x.
Therefore, the measure of angle ACB is 186 - 5x degrees.