In history, what altered the development and population of sub-saharan africa?
a potato famine
the atlantic slave trade
a tsunami
a hurricane

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.

it would be that mali has the worst literacy rate than the others