Im bored :/ if anyone wants to add me on disc its Andreww#6506

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 expression is rational? 6. , square root two, square root 14, square root 49

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.