In an isosceles triangle, the angles opposite to the two equal sides are also congruent. Based on your information, T and S are congruent. So we know that the measure of angle T is 3x+7. But we need to solve for x. Let's add all the angle values together and set it to 180 because the angles of a triangle sum to 180. 1) 2(3x+7) + 2x - 2 = 180 2) 6x + 14 + 2x - 2 = 180 3) 8x + 12 = 180 4) 8x = 168 5) x = 21 6) m<T = 3x + 7 = 3(21) + 7 = 63 + 7 = 70 I got C, but it is always helpful to double check work. Hope this helps!
