Activity
Here are graphs representing two functions and descriptions of two functions.
- Function : The area of a wall that is covered by Mold A, in square inches, doubling every month.
- Function : The area of a wall that is covered by Mold B, in square inches, tripling every month.
1. Which graph represents each function? Explain your answer.
Compare your answer:
Since Mold B is growing more quickly, the graph that shows a greater growth factor (the one starting lower and ending higher) is function (solid).
2. When the mold was first spotted and measured, was there more of Mold A or Mold B? Explain how you know.
Compare your answer:
There was more of Mold A. The graph for (dashed) shows a greater vertical intercept.
3. What does the point tell us in this situation? Explain your answer.
Compare your answer:
After months, there was the same amount of Mold A and Mold B on the wall ( square inches), after which Mold B started to have larger area than Mold A.
Self Check
Additional Resources
Reading Exponential Graphs
The graphs of and are located below and are functions of the form .
Which curve has the larger value?
because its -intercept is higher.
Which curve has the larger value?
because it is growing more quickly.
Try it
Try It: Reading Exponential Graphs
The graphs of and are located below and are functions of the form .
Which curve has the larger value?
Compare your answer:
has the larger value because it is growing faster than .