Beginning Algebra, 11th Edition

Using Percents to Find Percentages (a)If a chemist has 40 L of a 35% acid solution, then the amount of pure acid in the solution ...

SECTION 2.7 Further Applications of Linear Equations^141 Step 3 Write an equation.The number of liters of pure acid in the 70% s ...

Step 3 Write an equation.Multiply amount by rate to get the interest earned. Interest interest total at 6% plus at 7% is interes ...

SECTION 2.7 Further Applications of Linear Equations^143 Step 3 Write an equation.Multiplying the number of bills by the denomin ...

(c) At the 2008 Olympic Games, Australian swimmer Leisel Jones set an Olympic record of 65.17 sec in the women’s 100-m breaststr ...

SECTION 2.7 Further Applications of Linear Equations^145 Solving a Motion Problem Two planes leave Memphis at the same time. One ...

8.The population of Alabama in 2007 was about 4,628,000, with 26.5% represented by African-Americans. What is the best estimate ...

SECTION 2.7 Further Applications of Linear Equations^147 17.In a chemistry class, 12 L of a 12% alco- hol solution must be mixed ...

Work each problem involving monetary values. See Example 4. 148 CHAPTER 2 Linear Equations and Inequalities in One Variable 27.A ...

SECTION 2.7 Further Applications of Linear Equations^149 In Exercises 39 – 42, find the rate on the basis of the information pro ...

45.A train leaves Kansas City, Kansas, and travels north at 85 km per hr. Another train leaves at the same time and travels sout ...

SECTION 2.8 Solving Linear Inequalities^151 OBJECTIVES Solving Linear Inequalities 2.8 1 Graph intervals on a number line. 2 Use ...

Graphing Intervals on a Number Line Write each inequality in interval notation, and graph the interval. (a) The statement says t ...

OBJECTIVE 2 Use the addition property of inequality.Consider the true inequality If 4 is added to each side, the result is Add 4 ...

154 CHAPTER 2 Linear Equations and Inequalities in One Variable OBJECTIVE 3 Use the multiplication property of inequality. Consi ...

Divide by 3. x6- 6 3 x 3 6 - 18 3 3 x6- 18 SECTION 2.8 Solving Linear Inequalities 155 3 is positive. Do NOT reverse the directi ...

Step 2 Use the addition property of inequality. Add 3. Subtract x. Step 3 Use the multiplication property of inequality. Divide ...

The next example uses the idea of finding the average of a number of scores. In general, to find the average of n numbers, add t ...

Graphing a Three-Part Inequality Write the inequality in interval notation, and graph the interval. The statement is read “ is l ...

(b) Multiply each part by 3 to clear the fraction. Distributive property Add 3 to each part. Divide each part by 2. The solution ...