What is the value of n

You can calculate the angle on the other side of the line where n is by first finding the other two angles.

Angles on a straight line add to make 180°.

So, 180° - 133° = 47°, and,

180° - 142° = 38°

Then you must add these two together,

47° + 38° = 85°

Angles in a triangle also add to make 180°, so you can find the angle on the other side of n, in the triangle.

180° - 85° = 95°

Since angles on a straight line make 180°, you can now find n.

180° - 95° = 85°, so n = 85°

The answer of n is c 85