Sean's family went on a long hike. they kept a log of the changes in elevation each half hour. they started the hike at an elevation of 6,080 feet. the changes in elevation for the hike were +45, +200, -80, +35, -20, and +110. what was the elevation at the end of their hike?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?