Nellie is in a hot air balloon that has just taken off and is floating above its launching point. Kevin is standing on the ground, 15 meters away from the launching point. If Nellie and Kevin are 17 meters apart, how high up is Nellie?

There are 1872 steps in a building that has 104 floors. each floor has the same number of steps. a second building has the same number of floors but 2 fewer steps between each floor. how many steps are there between each floor of the second building?