Ibought 3 bags of marbles. my friend bought 1 bag and he also had 24 loose marbles. we discovered that we had exactly the same number of marbles. a) make up an equation to show thus information b) solve the equation to determine how many marbles there are in each bag.

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.