Cientists tag a group of dolphins as they are born and release them in the water. Later, the catch a sample of dolphins that return to shore and check them for tags. In one sample, 40 out of 800 returning dolphins have tags. What is the best prediction of the total number of tagged dolphins in a sample of 2000? There would be about
dolphins that were tagged in the sample of 2000.

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

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.