Julio is training for a marathon. he runs 34 miles the first week and 29 miles the next week. during the third week, he wants to run as many miles as he ran the first 2 weeks combined. he plans to run an equal number of miles during each of the 7 days of the week. how many miles will julio run each day?

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.