Abuilding has a window that is 12 feet high. stan is going to use a ladder to get up to the window and decides to keep the ladder 5 feet away from the side of the building. how long does the ladder need to be?

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.