CP Algebra Name:

Chapter 7 Review

Determine whether the table is linear or exponential. Write an equation for each table.

1.

X / 0 / 1 / 2 / 3
Y / 3 / 9 / 27 / 81

2.

X / 0 / 1 / 2 / 3
Y / 10 / 5 / 2.5 / 1.25

3.

X / 0 / 1 / 2 / 3
Y / 60 / 56 / 52 / 48

4.

X / 0 / 1 / 2 / 3
Y / 1/4 / 1/2 / 3/4 / 1

5.

X / 0 / 1 / 2 / 3
Y / 10 / 100 / 1,000 / 10,000

7.

X / 0 / 1 / 2 / 3
Y / 3 / .3 / .03 / .003

8. A weight lifter can bench-press 165 pounds. She plans to increase the weight W(x) in pounds that she is lifting according to the function W(x) = 165(1.05)x, where x represents the number of training cycles she completes. How much will she bench-press after 4 training cycles?

Write the equation for each problem (9-18) and solve.

9. A city’s population is about 763,000 and is increasing at an annual rate of 1.5%. Predict the population of the city in 50 years?

10. A printing press valued at $120,000 depreciates 12% per year. What will be the approximate value of the printing press in 7 years?

11. Determine the amount of an investment if $700 is invested at an interest rate of 8% compounded monthly for 9 years.

12. If a lab researcher begins with 80 cells and triples (x 3) each hour. How many cells will there be after 5 hours?

13. The population of the U.S. has been increasing at an average annual rate of 0.91%. If the population was about 303,146,000 in 2008, predict the population in 2015.

14. Determine the value of an investment of $2500 if it is invested at an annual interest rate of 5.25% for 4 years.

15. It is estimated that the population of the world is increasing at an average annual rate of 1.3%. If the 2008 population was about 6,641,000,000 – predict the 2015 population.

16. Determine the value of a 5 year old car that is originally worth $75,000 but is depreciating at a rate of 20% each year.

17. The bank account had $10,000 in 2000. Its interest rate is 3.5% and is compounded monthly. How much money will there be in the account in 2015?

18. The loan that Mrs. Shepard took out was for $15,000. Its interest rate was 5% and is compounded quarterly. How much money will she owe in 2 years?