Maia and Chris were discussing a type of climate characterized by very low precipitation, localized extreme variations in temperature from day to night with organisms adapted for desert precipitation levels and temperature
extremes. They were discussing which climate?
A) desert
B) arid
C) semi-arid
D) tundra
E) Sub-Saharan

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