How did northern Africa's location affect the development of its civilizations? A. It kept them separate from other parts of Africa

B. It forced them to move farther south every year.

C. It allowed them to control all trade in the region.

D. It gave them access to valuable new technology.​

C

Explanation:

It allowed them to control all trade in the region

A

Explanation:

northern africa is surronded by desert, Thus making it hard for people to be able to get across, which makes a the correct choice.

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.

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