As of July, 2019, Florence Griffith-Joyner held the women’s world record for the 100 meter dash. She set the record with a time of 10.49 seconds in 19881. Which of the following calculations are correctly set up to convert this speed into miles per hour?

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.