Given the following revenue and cost functions, determine for what x-values a loss will occur. (Recall that profit equals revenue minus cost.)  R(x) = 60x - 2x 2; C(x) = 23x + 1071
 

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.

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 a column proof the right column states your reasons