Which of the following is closest to the distance between P and Q?

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.

Which of the following vectors are orthogonal to (2,1)? check all that apply

Identify the parent function that can be used to graph the function f(x)=3(x-9)2