Marti is filling a 10– inch diameter ball with sand to make a medicine ball that can be used for exercising. to determine if the medicine ball will be too heavy after it is completely full of sand, she did some research and found that there is approximately 100 pounds of sand per cubic foot. how heavy will the medicine ball be after it is filled with sand, rounded to the nearest pound? a.30 pounds b.58 pounds c.24 pounds d.83 pounds

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.