Math 8 Unit 3/4 Test Review

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Front

Calculate the percent increase: Average flight delay last year = 12.5 minutes, this year = 31.3 minutes.

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Percent increase = 150.4%.

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Calculate the total cost of AirPods priced at $118.98 with a sales tax of 7%.

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Total cost = $127.31.

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Define an inequality.

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An inequality is a mathematical statement that compares two expressions, showing that one is less than, greater than, less than or equal to, or greater than or equal to the other.

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What is the formula for calculating percent increase?

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Percent Increase = \frac{(New Value - Old Value)}{Old Value} \times 100%.

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What does it mean to solve an inequality?

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To solve an inequality means to find all values of the variable that make the inequality true.

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Multiply both sides by 5 to eliminate the fraction.

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What is the sales tax formula?

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Sales Tax = Price \times Tax Rate.