# match210.6

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1. Natural Numbers
• counting numbers
• {1,2,3, ...}
2. Whole Numbers
• counting numbers w/ 0
• {0,1,2,3, ...}
3. Integers
{..., -3, -2, -1, 0, 1, 2, 3, ...}
4. Rational Numbers
• Numbers that can be expressed as a ratio of 2 other numbers a/b where b cannon equal zero
• 3 = 3/1
• 1/2 = 0.5
5. Irrational Numbers
• Numbers that cannot be expressed as a ratio of 2 numbers a/b
• pi= 3.14... (never repeats, never terminates)
• non-perfect squares √2, √3, √5
6. Rules for working with integers
• 1. For any number x, -x is termed the inverse of x if the following relationship applies:
• x+(-x)=0
• 2. For any # x, -(-x)=x
• 3. 0 is neither positive or negative
7. Absolute Value
• for any # x, except 0, the absolute value will always be a positive number x
• |x|>0
8. Number Line
• graph of all integers & everything else in between (fractions, decimals), all real numbers
• 0 is origin
• L»R increase
• R«L decrease
• absolute value tells how far from origin point
• the number line is used to illustrate addition & subtraction of integers
9. compound interest
• A=P(1+r/n)nt
• A= balance amount
• B= principal
• r= interest rate
• n= compounding number
• t= time
10. compound interest
\$1,000, compounded quarterly, 3 years
• P= \$1,000
• r= 8%
• n=4
• t= 3

A= 1000(1+ .08/1)(4)(3)
11. Scientific Notation
• express very large & very small numbers
• format: base x 10exponent or power
• 10> base ≥ 1 exponent » integer
• (1-9.999), 2.5x102
 Author: _robg_ ID: 10547 Card Set: match210.6 Updated: 2010-03-15 04:15:54 Tags: math 210 unit 6 Folders: Description: math 210 unit 6 Show Answers: