Can you guys help me.
Rob’s Computer print part one of a banner which is 4 ft 8in long. Mary’s computer print the other part which is 5ft 7in long. How long is the entire banner?

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.