MATH~ ALGEBRA 1

percentile

A point on the distributionbelow with a certain % of scores fall. Ex: Scored in the 99th percentile = only 1% scored higher than you

subtraction property of equality

If you subtract the same number from each side of an equation, the two sides remain equal.

weighted average

Method to assign inventory cost to sales; the cost of available-for-sale units is divided by the number of units available to determine per unit cost prior to each sale that is then multiplied by the units sold to yield the cost of that sale., Wtd Avg. = (weight)(data point) + (weight)(data point) / sum of weight

percent of decrease

The percent of change found when the original amount decreases

metric

a rule for assigning a number to some characteristic or attribute

formula

a rule for relationships between certain quantities

multiplication property of equality

each side is multiplied by the nonzero number

identities

equations that are true for all values

equivalent equations

equations that have the same solution

extremes

first & last terms

rate

having different units of measure

unit rate

how many are being compared

unit analysis

including units for each quantity in a calculation to determine the unit of the answer

consecutive integers

integers in counting order

algebra tiles

manipulative that represent a constant or variable

means

middle terms of the proportion

debt-to-income

ratio used by mortgage lenders compares the total monthly debt, to total income. the figure should not exceed 36- is calculated by as/by

rate problems

set up like ratios; cross-multiply; solve for x

percent of change

the percent a quantity increases or decreases from its original amount

percent of increase

the percent of change when the new amount is more than the original amount

solve an equation

the process of finding all values of the variable that make the equation a true statement

scale

the relationship being measured

number theory

the study of number's and the relationship between them

deciles

type of percentile band, divides scores into tenths or 10 equal units

dimensional analysis

A method of using conversion factors and unit canceling to solve a unit conversion problem.

scale model

A model of an object in which the dimensions are in proportion to the actual dimensions of the object.

uniform motion problems

Another type of problem commonly solved using weighted averages; problems where an object moves at a certain speed, or rate; use the formula d= rt to solve them.

mixture problems

Types of problems commonly solved using weighted averages; two or more parts are combined into a whole.

ratio

a comparison of two number's by division

proportion

an equation stating that two ratios are equal

literal equation

an equation that contains two or more variables, An equation in which letters are used to replace the coefficients and constants of another equation.

multi-step equation

an equation that requires more than one step