Sal was tired of waiting for amir to show up at their meeting place, so he started running at an average speed of 4.5 mph without him. ten minutes later, amir still had 0.25 of a mile to go before he reached the meeting place, but sal was 0.75 of a mile beyond it. if amir is running at a faster pace, 6.7 mph, to the nearest hundredth of an hour, after how much time will amir catch up to sal?

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.