Do Now 9/13/10

1
Do Now 9/13/10

• 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?

2
HomeworkText 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

3
HomeworkText p. 10-11, 2-32 even

• 20). 7 7 was added before dividing 14 by
  7(113) 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)

4
Objective

• SWBAT translate verbal phrases into expressions.

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Section 1.3, Write Expressions

• EXPRESSION
• a collection of numbers and or variables that
  can be linked by , -, x, and

5 x
13 22 - 14
y² 8
11 x 9
6
Writing Expressions
Operation Verbal Phrase Expression
Addition
Subtraction
Multiplication
Division

• Sum, plus, total,
• more than,
• increased by

5 n k 12
Difference, less than, minus, decreased by
12 p x 12

• Product, times,
• of, multiplied by

3 x 5 3d (n)(w) p k
Quotient, divided by, divided into
k/7 14 r
7
Translate verbal phrases into expressions
Expression
Verbal Phrase
a.
6n 4
4 less than the quantity 6 times a number n
3(7 y)
b.
3 times the sum of 7 and a number y
c.
22 m2
The difference of 22 and the square of a number m
The quotient when the quantity 10 plus a number
x is divided by 2
d.
8
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.
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EXAMPLE 4
Finding a Unit Rate
A car travels 110 miles in 2 hours. Find the unit
rate.
10
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.
STEP 2
Write a verbal model and then an expression. Let
m be the number of extra minutes.
STEP 3
Evaluate the expression when m 22.
30 0.25(22) 35.5
Total Bill 35.50
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Homework
NJASK7 Prep

• Text p. 18-20, 4-36 even