20 terms

certain event

an event that is sure to occur and has a probability of 1.

commission

pay that is equal to a percent of sales.

complement

the opposite of an event.

cross products

the product of the numerator of one fraction and the denominator of another.

discount

the amount by which a price is decreased.

event

any outcome or group of outcomes.

impossible event

an event that will never occur and have the probability of 0.

indirect measurement

uses proportions in similar triangles to measure the distances that would be difficult to measure directly. (5ft. tall person standing near a tree has a shadow of 4 ft. long, the tree has a shadow 10 ft. long, you use this to find the height of the tree which is 12.5 ft.)

markup

the amount of increase in price.

odds

a ratio that compares the # of ways an event can occur (successes) to the # of ways it cannot occur (failures)

outcomes

possible results of an action.

percent

a ratio that compares a number to 100.

percent of change

the percent something increases or decreases from its original amount.

probability

a measure of how likely it is that some event will occur

proportion

an equality of two ratios.

rate

a ratio that compares quantities measured in different units.

ratio

a comparison of two quantities by division.

scale drawing

a drawing of an object that is different in size (usually smaller than the original) but keeps the same proportions

similar figures

has corresponding angles that are congruent and corresponding sides that are in proportion

unit rate

a rate that has a denominator of 1