There are 84 students in a speech contest. Yesterday, 1/3 students still haven't given their speeches?
of them gave their speeches. Today,
1/4 of the remaining students gave their speeches. How many students still haven't given their speeches?

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

Which expression gives you the distance between the points (5,1)and(9,-6)

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.