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First to answer brainliest

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.

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length