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# Math chapter 2

### vocab

QuestionAnswer
natural numbers The sets {1,2,3...}
whole numbers The set {0,1,2,3,...}
integers The set {...-2,-1,0,1,2}
positive numbers Any value that is greater then 0
negative numbers Any value that is less then 0
rational numbers The set of numbers expressed in the form of a fraction a/b, where a and b are integers and b is not equal to zero
graph To draw , or plot, the points named by certain numbers or ordered pairs on a number line or coordinate plane.
coordinate plane The plane containing the x and y-axis.
absolute value The absolute value of a number n is its distance from zero on a number line and is represented by I n I
opposites Every positive rational number and its negative pair.
additive inverse A number and its opposite are additive inverses of each other. The sum of a number an its additive inverse is 0.
line plot A number line labeled with a scale to include all the data with an x placed above a data point each time it occurs.
frequency How often a piece of data occurs
stem-and-leaf plot A system used to separate data into two numbers that are used to form a stem and a leaf.
back to back stem and leaf plot Used to compare to related sets of data
measures of central tendency Numbers or pieces of data that can represent the whole set of data
probability The ratio of the number of favorable outcomes for the event to the number of possible outcomes of the event.
simple event a single event
sample space The list of all possible outcomes.
equally like outcomes for which the probability for each occurring is equal
odds the ratio that compares the number of ways an event can occur to the number of ways an event cannot occur.
square root one of two equal factors of a number
perfect square a number whose square root is a rational number
radical sign The symbol used to indicate a nonnegative square root.
principle square root the non negative square root of a number
irrational numbers numbers that cannot be expressed at terminating or repeating decimals
real numbers The set of rational numbers and the set of irrational numbers together.
completeness property states that each point on a number line corresponds to exactly one real number
rational approximation A rational number that is close to , but not equal to, the value of an irrational number.
Created by: hgkaduson