There are 25 students in a class, and 6 of them will be chosen to go on a field trip. How many ways can these students be chosen?

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 difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

What does independent variable and dependent variable mean in math?