Julio's goal is to type an average of 50 words per minute on his five typing exams. his scores on the first four exams were 46,44,57 and 47 words per minute. how many words per minute will he need on his fifth exam to reach his goal? options: 56,58,50,51

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.