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Example1 . Simplify Example2 . What is the value of ?

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Example1 . Simplify Example2 . What is the value of ?

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  1. MES 21 9/18/13 Mrs. CabaneroAim: To be able to: *translate quantitative verbal phrases into algebraic expressions and *add and subtract signed numbers Do Now:1. A number decreased by 20 equals 36. Find the number.2. Ten less than a number is 42. Find the number.3. One-half of a number is 12. Find the number.4. When a number is doubled , the result is 36. Find the number.TEST this Friday 9/20/13

  2. Name ___________ HW#6 Pd __ 9/18/131. Write an algebraic expression: three less than four times a number2. Define variables and write an equation: The cost of a fur coat is 5 times the cost of a cloth coat. Represent the cost of the fur coat.3. Simplify: -6 – 10 4. Simplify: -15 + 85. Brett was given the problem: “Evaluate when x = 3.” Brett wrote that the answer was 41. Was Brett correct? Explain your answer.

  3. Name __________ HW#5 Pd __ 9/17/13Write an algebraic expression for each phrase in 1-2.1. the product of 2c and 3d2. one-half of the sum of L and W3. The length of a rectangle is represented by L. If the width of the rectangle is one-half of its length, represent its width.4. Simplify .5. Evaluate

  4. Translate the following verbal phrases into algebraicexpressions.1. the difference of n and seven2. the quotient of n and seven3. 7 less than twice a number4. the sum of n and 55. 4minus the product of 9 and a

  5. Define variables and write an equation to model each situation.1. What is the number of slices of pizza left from an 8-slice pizza after you have eaten some slices?2. Four times a number equals 20.3. If 7 is subtracted from a number, the result is 8.

  6. Vocabulary:*Counting numbers are also called natural numbers 1, 2, 3,…*Whole numbers are the counting numbers with zero. 0, 1, 2, 4, …*Opposite or additive inverse of a number is the number which is the same distance from 0 but on the opposite side of 0.Example: The opposite of 2 is -2. The opposite of -10 is 10. *The absolute value ,, of a number is its distance from zero. Example: and

  7. Adding Two Numbers with Same Signs:Add the absolute values and give the sum the common sign.Examples: 3 + 5 = 8 (-3) + (-5) = -8-3 – 5 = -8Adding Two Numbers with Unlike/Different Signs:Step1.Find the difference of the absolute values of the numbers.Step2. Give this difference the sign of the number with the greater absolute valueExamples: 9 + (-4) = 5 -9 + 4 = -5

  8. Example1. Simplify Example2. What is the value of ?

  9. Practice:1. The expression is equivalent to _____.2. Simplify .3. What is the value of the expression when x = 5 ?4. The value of the expression when a = 7 and b = -3 is ____.5. If r = 2 and s = -7, what is the value of ?

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