# Average Rate Of Change And Equations

### Text-only Preview

1. Average Rate of Change and Equations…
2. Do Now: The height, in feet, of a ball thrown into the air is modeled by h(t) = - 16t 2 – 96t , where t is measured in seconds. Graph the height of the ball seconds on the following grid. Use a scale on the x -axis of 3 boxes = 1 second. On the y­ -axis use 5 boxes = 40 feet.
• How far did the ball travel from t = 0 to t = 2 seconds?
• 128 Ft
• What was the average distance traveled for the first two seconds?
• 64 ft per second
• What is another name for this?
• average velocity
• Draw a line connecting (0, h (0)) and (2, h (2)). What is this line?
• secant line
• What does the average distance traveled (per second) represent in terms of this line?
• slope
• Write the equation of this line.
• y – 0 = 64(x – 0) or y – 128 = 64(x – 2)
3. In general, __________________________________, can be found by using the formula: The average rate of change of a function (slope of the secant) Where [a,b] is a closed interval on which f is defined
4. The equation of ___________________________, can be found by:
• 1. Finding the slope of the secant (AROC)
• 2. using point/slope with either point
The secant line
• In general, as the interval get smaller (as b gets closer to a ), what line are we approximating?
• tangent line
• In terms of the original problem, what does this represent?
• Instantaneous velocity
• In general, how can we represent this?