Item 10 your family has decided to put a rectangular patio in your backyard, similar to the shape of your backyard. your backyard has a length of 45 feet and a width of 20 feet. the length of your new patio is 18 feet. find the perimeters of your backyard and of the patio

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.