How many triangles can you make with angle measures of 26 degrees, 110 degrees, and 46 degrees? (explain in words or numbers)

Which is the completely factored from of xy^3-x^3y

How to do this , and can some one explain

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.