Answer:
B. 39°
Step-by-step explanation:
x + 24 + 2x + x = 180 is the equation I'll use.
x + 24 + 2x + x = 180 <em>{Step 1: Combine 2x, x, x to get 4x.}</em>
4x + 24 = 180 <em>{Step 2: Subtract 24 from both sides (180 - 24 = 156)}</em>
4x = 180 - 24
4x = 156 <em>{Step 3: Divide both sides by 4 (156 / 4 = 39)}</em>
x = 156/4
x = 39
The smallest angle is 39°. (The other two angles are 63° and 78°, respectively.)