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Math 8--Ch 7
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Terms in this set (20)
ratio, equivalent ratios
a comparison of two numbers using division. the ratio of a to b (where b is not equal to 0) can be written as a to be, as a/b or as a:b
rate, unit rate
a ratio of two quantities measured in different units i.e. an airplane climbs to 18,000 feet in 12 minutes the rate of clime is 18,000ft/12 minutes
proportion
An equation stating that two ratios are equivalent. 3/5 = 6/10
cross products
In a proportion a/b=c/d the cross products are ad and bc
scale model, scale
A model of an object in which the dimensions are in proportion to the actual dimensions of the object
percent
A ratio of whose denominator is 100.
percent of change
A percent that shows how much a quantity has increased or decreased in comparison with the original amount.
Percent of change P= amount of increase or decrease /original amount
percent of increase
The percent of change in a quantity when the new amount of the quaintly is greater than the original amount
percent of decrease
The percent of change in a quantity when the new amount of the quantity is less than the original amount
markup
The increase in the wholesale price of an item
interest
The amount earned or paid for the use of money
principal
An amount of money that is deposited or borrowed
annual interest rate
In simple interest, the percent of the principal earned or paid per year.
outcome
The possible results when an experiment is performed
event
A collection of outcomes of an experiment
favorable outcome
Outcomes corresponding to a specified event
probability of an event
A number from 0-1 that measures the likelihood that the event will occur
theoretical probability
When all outcomes are equally likely, the theoretical probability of an even is the ratio of the number of favorable outcomes to the number of possible outcomes
experimental probability
A probability based on a sample or repeated trials of an experiment. The experimental probability of an event is given by:
P(event)= number of favorable outcomes/Number of trials or items in sample
discount
a decrease in the price of an item
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