Question

Question was provided via image upload.

Explanation:

Step1: Recall angle - sum property of a triangle

The sum of interior angles of a triangle is 180°.

Step2: Set up an equation

$42 + 56+x=180$.

Step3: Simplify the left - hand side

$98 + x=180$.

Step4: Solve for x

$x=180 - 98$.
$x = 82$.

Answer:

82