Tropical plant fossils have been found in cold Arctic islands where they cannot survive in the present-day climate of this area. According to Wegener's theory, how were these ancient tropical plants able to survive in Arctic islands? Plants were more adaptable in the past.
The poles of Earth were warmer in the past.
Arctic islands were closer to the equator in the past.
Land movements warmed the landmasses in the past.

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