Answer: 11.375°
Explanation:
55 + (4x + 17) + (4x + 17) = 180° Set up equation
4x + 4x + 55 + 17 + 17 = 180° Commutative Property of Addition
8x + 89 = 180° Combine like terms
8x = 91° Subtract 89 from both sides
x = 11.375° Divide both sides by 8
Not entirely sure about this one; you might have to round the answer.