Transcript Homework Text p. 10-11, #2

Do Now 9/13/10
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Take out HW from Wednesday.
• Text p. 10-11, #2-32 even
Copy HW in your planner.
• Text p. 18-20, #4-36 even
• QUIZ sections 1.1 – 1.3 Wednesday
• Chapter 1 Test Friday
In your journal answer the following question.
Suppose “#” is a special operation that “a # b”
means 4a – 2b. What is 3 # 2? What is 2 # 3?
Is # a commutative operation?
Homework
Text p. 10-11, #2-32 even
2). Substitute 3 for x. Then multiply 3
times 3; add 9 +1; square 10; multiply 2
times 100. The result is 200.
4). 4
6). 47
8). 1 1/2
10). 16
12). 40
14). 1
16). 0
18). 32
Homework
Text p. 10-11, #2-32 even
20). 7 + 7 was added before dividing 14 by
7;(1+13) ÷ 7 +7 = 14 ÷ 7 + 7 = 2+ 7 = 9
22). 16
24). 11
26). 15
28). 3 1/22
30). ¼
32). (9 + 39 + 22) ÷ (11 – 9 + 3)
Objective
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SWBAT translate verbal phrases into
expressions.
Section 1.3, Write Expressions
EXPRESSION –
a collection of numbers and or
variables that can be linked by +,
-, x, and ÷
Writing Expressions
Operation
Verbal Phrase
Expression
Addition
Sum, plus, total,
more than,
increased by
5+n
Subtraction
Difference, less than,
minus, decreased by
12 – p
Multiplication
Product, times,
of, multiplied by
k + 12
3x5
3d
(n)(w)
Division
Quotient, divided by,
divided into
k/7
x – 12
y
7
p∙k
14 ÷ r
Translate verbal phrases into expressions
Verbal Phrase
Expression
a. 4 less than the quantity 6 times a number n
6n – 4
b. 3 times the sum of 7 and a number y
3(7 + y)
c. The difference of 22 and the square of a
number m
22 – m2
d. The quotient when the quantity 10 plus
a number x is divided by 2
10 + x
2
RATE –
a fraction that compares two
quantities of different
measurement.
Examples of rates: speed, distance, wages
45miles
hour
5 meters
second
8 dollars
hour
A UNIT RATE is a
rate that has a
denominator of 1.
EXAMPLE 4
Finding a Unit Rate
A car travels 110 miles in 2 hours. Find the unit rate.
110 miles
2 hours =
110 miles
2 hours
2
55 miles
2 = 1 hour
Your basic monthly charge for cell phone service is $30, which
includes 300 free minutes. You pay a fee for each extra minute you use.
One month you paid $3.75 for 15 extra minutes. Find your total bill if you
use 22 extra minutes.
STEP 1 Calculate the unit rate.
3.75
15
0.25
=
1
= $.25 per minute
STEP 2
Write a verbal model and then an expression. Let m be the number of
extra minutes.
30
+
0.25
m
STEP 3
Evaluate the expression when m = 22.
30 + 0.25(22) = 35.5
Total Bill: $35.50
NJASK7 Prep
Homework
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Text p. 18-20, #4-36 even