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# 0.1_bzca5e - Section P1 Algebra Expressions and Real...

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Section P1 Algebra Expressions and Real Numbers

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Algebraic Expressions
Example: 3 7 7 7 7 = × × Algebraic Expressions are combinations of variables and numbers using the operations of addition, subtraction, multiplication, or division as well as powers or roots.

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Evaluating Algebraic Expressions

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2 2 3( 1) 4 for x =3 x + - - Example Evaluate an Algebraic Expression
Formulas and Mathematical Models

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Mathematical Modeling – the process of finding formulas to describe real-world phenomena.
Example It takes you 30 minutes to get to your first period class. This includes driving at a rate of . 8 miles per minute, and walking from the parking lot to your class at a rate of .07 miles per minute. The total distance of both walking and driving is given by the algebraic expression. Find the distance if it takes you 5 minutes to walk to class. 0.07 .8(30 ) D t t = + -

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Sets
The Roster Method- lists the elements of the set, with commas in between. The three dots (ellipsis) indicate that the listing continues for ever.

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