Sam has 2,450 in his bank account he spends 20 dollars each week on gas money. after how many weeks will sam's account balance fall below 1,000

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

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.

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2