I'm doing sine, cosine, and tangent and I don't know what an opposite is in the triangle so if anyone can explain it in the most simple terms possible, that'd be great

Step-by-step explanation:

okay so basically when you have a triangle, the side that is directly across from the angle you are looking for is the "opposite". here is an attachment.

A side opposite of an angle in a triangle is the angle that’s not adjacent to it.
In other words, an angle will touch 2 sides in a triangle. The one it doesn’t is the opposite angle.
See if the photo below helps you.

The range would be 13 because you’re finding the difference