Edwin Powell Hubble discovered that . A) the sun is the center of our solar system
B) many galaxies exist beyond the Milky Way
C) a land bridge once existed between North America and Asia
D) DNA is the substance that is responsible for each person’s traits

B

Explanation:

many galaxies exist beyond the milky way

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