Question

find the value of x.

Explanation:

Step1: Recall angle - sum property

The sum of interior angles of a quadrilateral is 360°.

Step2: Set up equation

$125 + 76+84 + x=360$.

Step3: Simplify left - hand side

$125+76 + 84=125+(76 + 84)=125 + 160=285$. So the equation becomes $285+x = 360$.

Step4: Solve for x

$x=360 - 285$.
$x = 75$.

Answer:

$75$