Which statement best explains why the United States grew into a world economic power in the 20th century?
A. The United States stayed out of major world wars and instead
made economic investments.
B. The United States put effective trade barriers in place to limit trade
with other nations.
C. The United States prevented other countries from abandoning the
gold standard
D. The United States increased its participation in international trade.

Most likely D

Explanation:

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