Question 446376
let bill board height be x
building height =y

Tan 47 = (x+y)/134.9

Tan 39.4 = y/134.9

Tan 47-Tan 39.4 = (x+y)/134.9 - y/134.9
Tan 47-Tan39.4 = x/134.9
x= 134.9(Tan 47-tan39.4)
x= 33.85 feet