1: if a tree is four years old, which is the best prediction of the height of the tree after six feet? Answer choices are: 2ft, 4ft, 6ft, 5ft,7ft,9ft 2: if a tree is 10 feet tall, which is the best prediction of the age of the tree after ten feet?
Answer choices are: 12 years, 8 years, 10 years.

3: if a tree is 6 years old which is not a reasonable prediction of the height of the tree? Answer choices are: 2ft, 4ft, 6ft, 5ft,7ft,9ft

please answer them all..
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If the public debt of a country in 2009 was $10432000000000 and the budget for 2010 was in deficit by $201645000000, what was the public debt in 2010? do not include commas in your answer.

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2

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.