Can someone plz help me with this one problem plz

John bought 2 horses at rs 20000 each

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

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.