Erica owns a -pen dog kennel and wants to expand the size of each pen by a scale factor of . Each pen currently has a fenced perimeter of feet. If she plans to use the fencing currently around each pen, how much additional fencing is needed for the expansion?

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.