Answer:
a.) 98°
Explanation:
Angle 5 and angle 8 (82°) are supplementary angles. This means that their sum will make a straight angle of 180°. Make an equation:
![82+x=180](https://img.qammunity.org/2021/formulas/mathematics/high-school/o6hjs27ngzrzk4r1kai88bfp2zkbznh3f2.png)
Solve for x, the value of angle 5:
![x=180-82\\\\x=98](https://img.qammunity.org/2021/formulas/mathematics/high-school/dlv7vg8wtfxrec26uy3bz48ijom73s39ur.png)
Angle 5 has a measure of 98°.
Now we know the measure of angle 5. Angle 4 and angle 5 are alternate interior angles, so they are congruent. Therefore, angle 4 has a measure of 98°.
:Done