There are 12 runners in a race. In how many ways can these runners place first , second, and third?
A:6. B:144. C:220. D:1320.

Dilations map circles to circles and ellipses to ellipses with the same. true or false

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.

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x