The border between the united states and canada is 8963 km long. the total length of the great wall of china, including it's branches, is 6324 km. how much longer than the great wall of china is the candian/us border? me

Through non-collinear points there is exactly one plane.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?