Asimple index of three stocks opens the day with these values the index rises 4.9% over the course of the day. what is the value of the index at the end of the day? round your answer to the nearest hundred. a- $70,400 b- $68,300 c- $67,100 d- $68,700

if triangle abc is congruent to triangle def, their interior angles are congruent, because congruent parts of congruent triangles are congruent (cpctc).

that means ∠d is congruent to ∠a; ∠d is equal to 8x - 2.

interior angles of all triangles add to equal 180 degrees, so you can set the sum of these interior angle values equal to 180 and solve for x.

180 = (8x - 2) + 22 + 72

180 = 8x - 2 + 22 + 72

180 = 8x + 92

88 = 8x

11 = x

x = 11