Intermediate Algebra (11th edition)

52.During the first part of a trip on the highway, Jim and Annie averaged 60 mph. In Hous- ton, traffic caused them to average o ...

SECTION 7.6 Variation 407 OBJECTIVES Functions in which y depends on a multiple of xor y depends on a number divided by xare com ...

Pvaries directly as h. Substitute 795.50 for Pand 43 for h. Use a calculator. Her hourly wage is $18.50, and Pand hare related b ...

SECTION 7.6 Variation 409 One variable can be proportional to a power of another variable. Direct Variation as a Power yvaries d ...

The inverse variation equation defines a rational function. Another example of inverse variation comes from the distance formula ...

SECTION 7.6 Variation 411 Let the weight and the distance from the center of Earth, for some constant k. wvaries inversely as th ...

412 CHAPTER 7 Rational Expressions and Functions OBJECTIVE 5 Solve combined variation problems. There are many combi- nations of ...

SECTION 7.6 Variation 413 Concept Check Determine whether each equation represents direct, inverse, joint, or combinedvariation. ...

39.The weight of an object on Earth is directly proportional to the weight of that same object on the moon. A 200-lb astronaut w ...

SECTION 7.6 Variation 415 52.The collision impact of an automobile varies jointly as its mass and the square of its speed. Suppo ...

7.1 rational expression rational function 7.2 least common denominator (LCD) 7.3 complex fraction 7.4 domain of the variable in ...

7.1 Rational Expressions and Functions; 8.5 Multiplying and Dividing Radical Expressions Rational Function A function of the for ...

7.2 Adding and Subtracting Rational Expressions Adding or Subtracting Rational Expressions Step 1 If the denominators are the sa ...

7.4 Equations with Rational Expressions and Graphs Solving an Equation with Rational Expressions Step 1 Determine the domain of ...

7.6 Variation Let kbe a real number. If then yvaries directly as If then yvaries inversely as If ykxz, then yvaries jointly as ...

7.3 Simplify each complex fraction. 21. 22. 23. 24. 7.4 Solve each equation. 25. 26. 27. 28. 29.Concept Check Professor Dan Abbe ...

7.6 39.Concept Check In which one of the following does yvary inversely as x? A. B. C. D. Solve each problem. 40.For the subject ...

CHAPTER 7 Test 423 Solve each problem. 59.The strength of a contact lens is given in units called diopters and also in millimete ...

Add or subtract as indicated. 10. 11. Simplify each complex fraction. 12. 13. 14. 15.Identify each of the following as a ...

CHAPTERS 1–7 Cumulative Review Exercises 425 1.Evaluate for and Solve each equation or inequality. Solve each prob ...