Answer:
It is B
Step-by-step explanation:
Answer: 
Step-by-step explanation:
Given
The length of the shadow is 78 ft
the angle of elevation is 
Suppose the height of the building is 
From the figure, we can write

The height of the building is 45.03 ft
C-d=b add to both sides d and will get
c-d+d=b+d
c=b+d
hope helped
Answer:
c=3
Step-by-step explanation:
do u need the explanation?
Add sin(x) to both sides
tan(x)sin(x)=sin(x)
Divide sin(x) from both sides
tan(x)=1
now you just have to figure out where tan(x)=1. you can figure this out from there by looking at the unit circle.