Asignificant change that occurred during the industrial revolution was the consolidation of manufacturing into a few large centers that produced nearly all the goods for the whole nation. this system could not have been successful without which of the following advances?
-invention of sewing machine
-development of genetically modified crops
-implementation of agricultural machinery
-improvements in railroad and steamship transportation

i think the answer is a.

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