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 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 |