Exercise 1 solution

Round dance: tells foragers food is within 50 metres (160 ft) of the hive; leaves out direction (the article says it gives insufficient information about direction).
Waggle dance: may be vertical or horizontal; gives more detail about both distance and direction.
Both are performed by the returning forager on the vertical comb. Foragers are also thought to use smell once directed.

50 m x 3.28084 = 164.04 ft. The article's 160 ft is a rounded figure, not exact, but close enough for a rough distance.