Angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x’y’z’. which statement shows the measure of angle x’y’z’?

Adozen bananas weigh 3 pounds how many ounces does 1 banana weigh

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.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.