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Pearson Algebra 1 Common Core, 2011

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Pearson Algebra 1 Common Core, 2011 View details

1. Inequalities and Their Graphs

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Exercise 70 Page 170

Is the value of the new amount greater than or less than the value of the original amount?

Decrease; 10 %

Practice makes perfect

To determine percent change p, we can use the following general formula. p %=Amount increase or decrease/Original amountFrom the given values, we can see the original amount was 20 and the new amount is 18. This is a decrease in the amount. 20- 18= 2 The difference between the original amount and the new amount is 2. Now, we can use the formula.

Percent change=Amount of decrease/Original amount

SubstituteValues

Substitute values

Percent change=2/20

a/b=.a /2./.b /2.

Percent change=1/10

Use a calculator

Percent change=0.1

Convert to percent

Percent change =10 %

The percent decrease is 10 %.

Subchapter links

Lesson Check p.167

Practice and Problem-Solving Exercises p.168-170

Standardized Test Prep p.170

Mixed Review p.170