Leaving the outpost, Alejandro went on a three-day journey into the desert. His displacement (distance and direction) from start to finish on day one was du = 3i + 7j. His displacement from start to finish on day two
=-li +85. His displacement on day three, dz, took him back to the outpost.
was d2 =
(Distances above are given in kilometers, km.)
What distance did Alejandro travel on day three?
km
(Round to the nearest tenth.)
In what direction did Alejandro travel on day three? Assume 0 is the rightward direction.
(Round to the nearest degree. Your answer should be between 0 and 36096

Runners run around the school's football field. the cross country coach determines that the width of the field is seventy yards shorter than the length. part a write an expression that represents the perimeter of the football field. let x represent the length of the football field. include parentheses in your expression. next, write an equivalent expression that does not include parentheses. what property or properties did you use to simplify? explain. part b the cross country coach later determines that the length of the football field is 120 yards. all students must run five laps. using your answer from part a, determine the actual number of yards that each athlete must run in the tryouts. in order to make the team, students must complete the laps in 6 minutes. how quickly must they run each lap?