Which of the following is an example of the reciprocity norm? a. a young child learn algebra b. doing weekly chores for one’s parents c. leaving the waiter a tip while traveling d. treating oneself to a movie night

Reciprocity norm is a sociological concept where we are expected to repay someone for what they have done for us. It does not always mean a monetary compensation; it can also come in the form of exerting effort for someone else’s needs.

From the options given in the question, the best example of this norm would be (B) doing weekly chores for one’s parents.    

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