Question

1. write an equation and solve for x. x + 55 56° 78° equation: x =

Explanation:

Step1: Use angle - sum property of triangle

$(x + 55)+56 + 78=180$

Step2: Simplify the left - hand side

$x+189 = 180$

Step3: Solve for x

$x=180 - 189=-9$

Answer:

Equation: $(x + 55)+56 + 78=180$
$x=-9$