1-12

In Exercises 13, evaluate the expression for (a) x = 2 and (b) x = 3. 1. 3* 2. 5e2* 3. 342" In Exercises 49, tell whether the function represents exponential growth or exponential decay. Then graph the function. 4. y= S* 5. Vv 6. y= (4) II 7. 5 (3) 8. y = (1.6)' 9.) II % In Exercises 10 and 11, use the graph of f(x) = b* to identify the value of the base b. 10. Ti; 12. The value of a truck y (in dollars) can be approximated by the model y = 54,000(0.80)' , where t is the number of years since the truck was new. a. Tell whether the model represents exponential growth or exponential decay. b. Identify the annual percent increase or decrease in the value of the truck. c. What was the original value of the truck? d. Estimate when the value of the truck will be $30,000