Question 1076201
You're standing on the roof, 25 ft. above ground. Your line of sight to the base of the building across the street is 38° from horizontal. If this is true, then the angle between you looking straight down to the bottom of your building to the bottom of the office building is 90-38, or 52°. If your building is 25' tall, then n/25=tan 52°(where n is the distance from your building to the office building). So:
n=25 tan 52°=32 ft. 
Now, we know m/32=tan 46°, where m is the difference in height between the 2 buildings. So m=32 tan 46°, or 33.14 ft. difference. So, the office building is 25 +33.14, 58.14 ft. tall. &#9786;&#9786;&#9786;&#9786;