4-89.
  CLIMBING IN YOSEMITE David and Emily are climbing El Capitan a big cliff wall in Yosemite National Park David is on the ground holding the rope attached to a carabiner a rope pulley that is on the wall above Emily as she climbs When Emily stops to rest David wonders how high she has climbed The rope is attached to his waist about 3 feet off the ground and he has let out 48 feet of rope which goes up to the
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