African slaves often used Christian hymns to communicate. The slaves used these hymns in order to communicate coded messages to each other about their conditions, and possible avenues for escape. The slaves' overseers thought that the slaves were simply singing religious songs and were not able to recognize the messages hidden within these songs. These hymns had an influence on the later musical style of the African American spiritual.
It depends what shape it is. A triangle is equal to 180 degrees. That square at the top of the triangle means 90 degrees. 48+90=138 138-180=42. So your answer is D.
The battle of Stalingrad was the major turning point.
I believe your answer is the Aztecs.
