Abuilding that is 100 ft tall casts a shadow that makes a 30 degree angle with the ground. approximately how long, in feet, is the shadow across the ground?

100 is how long the shadow would be.

To solve, remember the ratio for a 30/60/90 triangle:
short side = x
long side = x
hypotenuse = 2x

the short side is the building, which is 100, so the long side is 100

It’s hard to understand what you put.. can you show a picture ?

2/1 or just 2. sorry if i get this wrong