Stock Analysis 7A Financial analysts use graphical models to predict stock values for a new stock. It is important for stock brokers to know about instantaneous changes of a stock price. To create a stock pricing model, analysts look at past behavior and future expectations for that stock. A stock broker has developed the following model for the price of his favourite stock: 2t+at+b,t < 0 f(t) = a, t=0 (3(t+1)+c,t> 0