Kim is studying the sale of a particular brand of cereals from the year 2000 to 2010. She writes the following function to model the sale of the cereal S(t), in million dollars, after t years:

S(t) = t^2 + 7t + 69

Part A: What does the y-intercept of the graph of the function represent?

Part B: What is the reasonable domain of the graph of the function?

Part C: What is the average rate of change of the sale of the cereal from the first year to the fourth year?

Question

Kim is studying the sale of a particular brand of cereals from the year 2000 to 2010. She writes the following function to model the sale of the cereal S(t), in million dollars, after t years:

S(t) = t^2 + 7t + 69

Part A: What does the y-intercept of the graph of the function represent?

Part B: What is the reasonable domain of the graph of the function?

Part C: What is the average rate of change of the sale of the cereal from the first year to the fourth year?