What is zinn's approach to the study of history? what does he suggest occurs when history is told is the story of human progress?

think kush in nubia is not as well

answer: this problem has only trivial solutions, with all points on the same line. x=5 or x=7/5.

step-by-step explanation:

there are three triangles, and three unknowns: x, y=length of middle segment, and z=cos(angles marked with red arc).

we need

and law of cosines,

the three equations are

see attached image for solution.