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Every weekend, Elena takes a walk along the straight road in front of her house for 2 miles, then turns around and comes back home. Let’s assume Elena walks at a constant speed.
Here is a graph of the function that gives her distance , in miles, from home as a function of time if she walks 2 miles per hour.
Sketch a graph of the function that gives her distance , in miles, from home as a function of time if she walks 4 miles per hour.
Remember Clare on the Ferris wheel? In the table, we have the function which gives her height above the ground, in feet, seconds after starting her descent from the top. Today Clare tried out two new Ferris wheels.
Complete the table for the function .
| 0 | 212 | ||
| 20 | 181 | ||
| 40 | 106 | ||
| 60 | 31 | ||
| 80 | 0 |
Function is a transformation of function due to a scale factor.
A sphere, cylinder, and cone all have the same radius, . The cone and cylinder each have a height of 5 units.
Here are two graphs showing the distance traveled by two trains hours into their journeys. What do you notice?
Train A traveled 25 miles in 1 hour, and Train B traveled 25 miles in half the time. Similarly, Train A traveled 150 miles in 4 hours, while Train B traveled 150 miles in only 2 hours. Train B is traveling twice the speed of Train A.
A train traveling twice the speed gets to any particular point along the track in half the time, so the graph for Train B is compressed horizontally by a factor of when compared to the graph of Train A. If the function represents the distance Train A travels in hours, then represents the distance Train B travels in hours, because Train B goes as far in hours as Train A goes in hours.
If a different Train C were going one fourth the speed of Train A, then its motion would be represented by and the graph would be stretched horizontally by a factor of 4 since it would take four times as long to travel the same distance.