Month: May 2014

Problem 371 Give two example of rates that people commonly encounter.   Solution   a. There are different discount rates on products in sale. b. Bank offers different interest rates for loan.…

Problem 370 Let A be the set cintaining all rational numbers that are less than 5. Is there a rational number q in set A such that all other numbers…

Problem 369 The Sewing Supplies Problem. The seamstress purchased 2.4 meters of 3.90 per meter, 7.5 meter at 0.25 per meter, and two spools of thread at 10.50 per hour…

Problem 368 Describe the connection between rational numbers and division   Solution We can represent any rational number as division of two integers.  

Problem 367 Find each sum or difference. a. 15.6 +  8.305 + 0.4 b.   Solution a. 15.6 + 8.305 + 0.4 = 24.305 b. = = =  

Problem 366 Write the following rational number in scientific notation: a. 0.000005 b. 30 million c. 0.036754 d. 24,000,059   Solution a.       5.0 × 10-5 b.      3.0 × 107 c.      …

Problem 365 Is the product of two irrational numbers always an irrational number? Justify your answer.   Solution   No, the product of two irrational numbers isn’t always another irrational…

Problem 364 Use common denominators to compare the pairs of rational number. In each of the following, identify which one is greater and explain how you know. ,   Solution…

Problem 363 Use a linear model (for example, a number line, a ruler) to compare the pairs of rational numbers that follow.  Identify which one is greater in each pair…

Problem 362 The Olympic Race. At the  1988 Summer Olympics in Seoul, South Korea, Florence Griffith-Joyner ran the 100-meter dash in 10.49 seconds (a world record). What was her speed…