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3Ift A
31
4. As a hot air balloon rises vertically, its angle of elevation from a point P on level ground 110 km
from the point Q directly underneath the balloon changes from 1920' to 31&quot;50'. How far does
the balloon rise during this period.
5. At a point on the ground in front of a building, the angle of elevation to the bottom of a
smokestack (located on top of the building) is 35 and the angle of elevation to the top of the
smokestack is 53. If the smokestack is 125 feet tall, how far is the person standing from the
base of the building?

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