Me w/ this geometry question. image attached.

<7 = <2 (Alternate exterior angles)

3x + 10 = 70

3x = 60

x = 20

Answer is the 2nd one

20

Theorem: If two angles of a triangle are not congruent, then the sides opposite them are not congruent, and the longer side is opposite the larger angle. Two ways to prove that a triangle is isosceles If at least two sides of a triangle are congruent,then the triangle is isosceles