Answer:
7.
the buildings are 726.67 feet apart
8.
distance between zack and water fountain = 140.98 feet
Explanation:
angle of depression is defined by the formula:
tan y = height of the observer /
horizontal distance between the object and the observer
7.
according to the conditions given in the question:
let x be the distance between the buildings
tan 42 = 654 / x
x * tan 42 = 654
x = 654/.900 = 726.67 feet
8.
according to the conditions given in the question:
let x be the distance between zack and water fountain
tan 28 = 75 / x
x * tan 28 = 75
x = 75/.532 = 140.98 feet