1. lesson 21.notebook September 20, 2013
Assignment:
1­­>Pythagorean Theorem Handout ­ Due Monday (9/23)
2­­>Set 21 (thirds) ­ Due Monday (9/23)
3­­>Test #2 signed for extra credit??

2. lesson 21.notebook September 20, 2013
Lesson 21 Warm­Up:
1) Simplify: 144
2) Solve by inspection: 8x + 2 = 90
3) How many square YARDS are needed to cover the floor of a
classroom that is 30 FEET long and 30 FEET wide?
4) Julie can read 66 books in one year. At this rate, how many can she
read in 4 months?
5) Name 4 sets of numbers of which zero is a member.

3. lesson 21.notebook September 20, 2013
Lesson 21:
*Distributive Property:
a(b + c) = ab + ac OR a(b – c) = ab – ac
FYI...
­expand­­> 2(a + b) =
­factor­­>2a + 2b =

4. lesson 21.notebook September 20, 2013
More FYI...
ORDER OF OPERATIONS:
­Parentheses (Please)
­Exponents (Excuse)
­Multiply/Divide [left to right] (My Dear)
­Add/Subtract [left to right] (Aunt Sally)

5. lesson 21.notebook September 20, 2013
Examples ­ Lesson 21
Expand:
A) 2(3 + w)
B) 5(x ­ 3)
C) 12(x + y ­ 5)

6. lesson 21.notebook September 20, 2013
Factor:
D) 9x + 6
E) 8w ­ 10
F) 12x + 32y ­ 8

7. lesson 21.notebook September 20, 2013
Simplify:
G) 2 + 5 2 ­ 1
H) (2 + 5) (2 ­ 1)

8. lesson 21.notebook September 20, 2013
I) 4 + (11 ­ 32) 23
J) 10 ­ [8 ­ (6 ­ 3)]
K) 36 + 64
L) |8 ­ 12|