In what way was germany divided by the berlin wall?

Which of the following areas has the highest population density?

Can someone answer all these questions i need it done by tonight. once again

Afootpath is to be constructed in a park in the shape of a parallelogram. when a coordinate plane is laid over a map of the park, the vertices of the footpath are (-4,2) (8,2) (11,7) and (-1,7). what is the perimeter of this path