For the period 2005-2016, the number of book titles (y) published by a small publishing company can be modeled by the function y=0.5x^2+4x+19, where x is the number of years since 2005. In what year did the company published 90 books?

What is the binomial expansion of (2x-3)^5

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.

What fraction is equivalent to 0.46464646··· a. 46⁄99 b. 46⁄999 c. 46⁄100 d. 23⁄50