"An environmental engineer is researching a new kind of biodegradable plastic and finds exciting results for the rate of decomposition. The engineer is deciding whether to publish the research in a conventional journal or in an open access journal. In terms of access, who is least likely to be affected by the decision to publish in an open access journal?"

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

post the graph so people can answer