Can you explain how to get 2160÷675 step by step?

The system of equations graphed below has how many solutions?

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?

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.