Given A = {a, b, c, d} and B = {1, 2, 3, 4} , sets A and B can be defined as?

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

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.

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take