Materials scissors and tape or figure from Intervention Lesson F21.
- 10 -9-8-7-6-5-4-3 -2 -1 0
1
2
3
4
5
6
7
8
9
10
1. Cut out the figure in the lower right corner of the page.
Fold on the dashed line, and tape closed.
Subtracting Integers
on the Number Line
2. Place the figure in the starting position, at zero.
To subtract -2 - 5, move the figure
backward 2 spaces to -2. Turn around
for the subtraction. To do this, flip the
figure over. Then move it forward (the
direction the figure is now facing)
5 spaces to -7.
• Always start at zero,
facing the positive
numbers.
• Move forward for
positive numbers.
• Move backward for
negative numbers.
Turn around for the
subtraction sign.
So-2 - 5 =
3.
Use the figure to find – 3 – 2.

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.

Calculate the average rate of change over the interval [1, 3] for the following function. f(x)=4(5)^x a. -260 b. 260 c. 240 d. -240

Mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.