Aladder is leaning against a building and makes 28° angle with the ground. the top of the ladder reaches 35 feet up on the building. what is the length of the ladder?

check the picture below.

make sure your calculator is in Degree mode.

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.