7. Jeremy is swimming across the Mississippi River at a speed of 8.5 mi/hr at a heading of 290. A. What is his speed north? What is his speed west? 8. A ladder is 9.00 meters long and leans against the side of a building. If the ladder is inclined at an angle of 75.0 above the horizontal. a. How far is the base of the ladder from the building? b. How far vertically up the side of the building does this ladder reach