1. Algebra 2 Notes February 4, 2009

2.  Take 5-10 minutes and work on your practice test. Work with others around you on problems you don’t understand.

3.  Reminder: A solution is a point that makes ALL equations in the system true  LOOK AT PAGE 152 ◦ No Solution: No point lies in all three planes ◦ One Solution: The planes intersect at one common point ◦ Infinite Solutions: The planes intersect at all the points along a common line

4.  Page 153: solve the following system using elimination…?  NO! Use Matrix Equations:

5.  REFFER TO THE CHART ON PAGE 156  Suppose you have saved $3200 from a part- time job and you want to invest your savings in a growth fund, and income fund, and a money market fund. Refer to the graph. To maximize your return, you decide to put twice as much money in the growth fund as in the money market fund. How should you invest your $3200 to get a return of $250 in one year?

6.  Monica has $1, $5, and $10 bills in her wallet that are worth $96 total. If she had one more $1 bill, she would have just as many $1 bills as $5 and $10 bills combined. She has 23 bills total. How many of each denomination does she have?

7. #1) A change machine contains nickels, dimes, and quarters. There are 75 coins in the machine, and the value of the coins is $7.25. There are 5 times as many nickels as dimes. Find the number of coins of each type in the machine #2) The sum of three numbers is -2. The sum of three times the first number, twice the second number, and third number is 9. The difference between the second number and half the third numbers is 10. Find the numbers.

8.  Pg157 #1-6, 10, 16, 19, 22-24, 26, 29