In Exercises 7-9, identify the initial amount a and the rate of decay (as a percent) of the exponential function. Evaluate the function when
t = 3. Round your answer to the nearest tenth.
7. y = 12(0.65) 8. y = 360(0.1) 9. h(t) = 550(0.4)
In Exercises 10 and 11, write a function that represents the situation.
10. A school population of 1200 decreases by 6% each year.
11. A stock valued at $49.50 decreases in value by 7% each year.
In Exercises 12 and 13, determine whether the table represents an exponential
growth function, an exponential decay function, or neither. Write the equation.
12.
13.
xo
1
2
3
х
0
1
2.
3
y 412 36 108
y
200
100 5025
In Exercises 14-16, determine whether the function represents exponential growth
or exponential decay. Identify the percent rate of change.
14. y = 3(0.4)
15. y = 18(1.3)
16. y = 41(1.07)