Math 138 Practices

1. If .

   1. Sketch the function step by step. (Keep track of and the vertical asymptote.]

   2. Find the inverse function for

2. A model for the number of people in Radford University community who have herd a certan rumor is
   
   

   1. Solve in terms of

   2. How many days will elapse before students have heard about the rumor?

   3. How many days will elapse before students have heard about the rumor?

3. Psychologists sometimes use the function
   
   to measure the amount learned at time (in minutes).

   1. How long will it take to learn words?

   2. Approximately how many words will the student have learned after minutes.

4. Solve the folllowing equations:

   1. 

   2. .

   3. .