Which of the following would simplify to 10m^12

Two lines parallel to a third line are parallel to each other. always sometimes or never

How many $20 bills do you need to have to make $280

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?