Sarah the Sub is the worst substitute teacher. She just can’t seem to get her students under control. But she is getting better...Last year Sarah got tied up & hung upside down by students 89 times. This year it only happened 74 times. What was the percent decrease in the number of times Sarah was tied up & hung upside down?Round to the nearest percent. A).16% C)18%
B).17% D).19%

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.