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A circular railroad-crossing sign has a diameter of 30 inches.
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Which measurement is closest to the area of the sign in square inches?

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.

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.

Hurry can a triangle can be constructed with angles measuring 115°,55°, and 20°? yes or no