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4.1 Lines, Angles, and Triangles - Exterior angle theorem
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The figure presents a triangle with a horizontal base. The left and right sides of the triangle are both extended past the top vertex of the triangle. The bottom left angle is labeled 70 degrees, and the bottom right angle is labeled 50 degrees. The angle above the left side of the triangle and below the extension of the right side of the triangle is labeled x degrees.

In the figure above, two sides of a triangle are extended. What is the value of x ?

A.

110

B.

120

C.

130

D.

140