Question

what is the value of n? 137.9°

Explanation:

Step1: Recall angle - sum property

The two angles are supplementary, so their sum is $180^{\circ}$.

Step2: Set up the equation

Let the unknown angle be $n$. We have $n + 137.9^{\circ}=180^{\circ}$.

Step3: Solve for $n$

$n=180^{\circ}- 137.9^{\circ}=42.1^{\circ}$

Answer:

$42.1$