1/9 − y2 when factored is:

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.

The measure of an angle is 117°. what is the measure of a supplementary angle?

Landon wrote that 3−2.6=4. which statement about his answer is true?