Open Up Resources Unit 4 Test Review

Front

What is percent change?

Back

Percent change is a way to express a change in value as a percentage of the original value. It is calculated using the formula: ((new value - old value) / old value) x 100.

Front

How do you calculate a 30% discount on a price?

Back

To calculate a 30% discount, multiply the original price by 0.30 and subtract that amount from the original price. For example, for a $120 item: $120 x 0.30 = $36; $120 - $36 = $84.

Front

What does it mean for a graph to be proportional?

Back

A graph is proportional if it passes through the origin (0,0) and shows a constant ratio between the two variables. This means that as one variable increases, the other variable increases at a consistent rate.

Front

What is the formula for calculating percent error?

Back

Percent error is calculated using the formula: (|estimated value - actual value| / actual value) x 100.

Front

If the temperature increases from 10° to 15°, what is the percent change?

Back

The percent change is 50% increase, calculated as ((15 - 10) / 10) x 100.

Front

What is a non-proportional relationship?

Back

A non-proportional relationship does not maintain a constant ratio between two variables and does not pass through the origin.

Front

How do you find the savings from a sale price?

Back

To find the savings, calculate the discount amount by multiplying the original price by the discount percentage, then subtract that from the original price.

Front

What is the slope of the line represented by the equation y = 8x?

Back

The slope of the line is 8, indicating that for every 1 unit increase in x, y increases by 8 units.

Front

What does a 25% percent error indicate?

Back

A 25% percent error indicates that the estimated value is 25% away from the actual value, showing the accuracy of the estimate.

Front

How do you determine if a graph is linear?

Back

A graph is linear if it forms a straight line when plotted, indicating a constant rate of change between the variables.