Exponents and Polynomials - XYZ Custom Plus

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594Chapter 9 Exponents and Polynomials35. 10 −2 ÷ 10 536. 10 −4 ÷ 10 237. 10 −5 ÷ 10 238. 10 −3 ÷ 10_110 7 _ 110 6 _ 110 7 _ 110 439. _10−210 −51,00040. _10−410 −71,00041. x 12 ÷ x −12x 2442. x 6 ÷ x −6x 1243. 2 12 ÷ 2 10444. 3 11 ÷ 3 9945. 10 _10 −310,00046. 102 _10 −510 7A B Simplify each expression. Write your answer using only positive exponents.47. 3x −2 ⋅ 5x 748. 5x −3 ⋅ 8x 615x 5 40x 349. 2x −2 ⋅ 3x −3 6 _x 550. 4x −6 ⋅ 5x −4_ 20x 1051. (4x −4 )(−3x −3 )52. (3x 2 )(−4x −1 )_− 12x −12x753. 7x ⋅ 3x −4 ⋅ 2x 554. 6x ⋅ 2x −3 ⋅ 3x 442x 2 36x 255. _x −3 ⋅ x 7_x −256. x −4 ⋅ x 6x −1x 5 x 457. _x −2 ⋅ x −8x 2x −1258. _x −5 ⋅ x −7x 3x −15Maintaining Your SkillsMake the following conversions.59. 6 minutes 45 seconds toa. Seconds405 secb. Minutes6.75 min60. 4 minutes 15 seconds toa. Seconds255 secb. Minutes4.25 min61. 3 pounds 8 ounces toa. Ounces56 ozb. Pounds3.5 lb62. 5 pounds 4 ounces toa. Ounces84 ozb. Pounds5.25 lb63. 5 feet 9 inches toa. Inches69 in.b. Feet5.75 ft64. 6 feet 3 inches toa. Inches75 in.b. Feet6.25 ft
Scientific NotationThere are many disciplines that deal with very large numbers and others that dealwith very small numbers. For example, in astronomy, distances commonly aregiven in light-years. A light-year is the distance that light will travel in one year. Itis approximately9.5ObjectivesA Write numbers in scientific notation.B Convert numbers written inscientific notation to standard form.5,880,000,000,000 milesIt can be difficult to perform calculations with numbers in this form because of thenumber of zeros present. Scientific notation provides a way of writing very large,or very small, numbers in a more manageable form.A Scientific NotationExamples now playing atMathTV.com/booksDefinitionA number is in scientific notation when it is written as the product of anumber between 1 and 10 and an integer power of 10. A number written inscientific notation has the formn × 10 rwhere 1 ≤ n < 10 and r = an integer.Example 1The speed of light is 186,000 miles per second. Write186,000 in scientific notation.Solution To write this number in scientific notation, we rewrite it as the productof a number between 1 and 10 and a power of 10. To do so, we move the decimalpoint 5 places to the left so that it appears between the 1 and the 8, giving us 1.86.Then we multiply this number by 10 5 . The number that results has the same valueas our original number but is written in scientific notation. Here is our result:Practice Problems1. Write 27,500 in scientificnotation.186,000 = 1.86 × 10 5Both numbers have exactly the same value. The number on the left is written instandard form, while the number on the right is written in scientific notation.BConverting to Standard FormExample 2If your pulse rate is 60 beats per minute, then your heartwill beat 8.64 × 10 4 times each day. Write 8.64 × 10 4 in standard form.Solution Because 10 4 is 10,000, we can think of this as simply a multiplicationproblem. That is,2. Write 7.89 × 10 5 in standardform.8.64 × 10 4 = 8.64 × 10,000 = 86,400Looking over our result, we can think of the exponent 4 as indicating the numberof places we need to move the decimal point to write our number in standardform. Because our exponent is positive 4, we move the decimal point from itsoriginal position, between the 8 and the 6, four places to the right. If we need toadd any zeros on the right we do so. The result is the standard form of our number,86,400.9.5 Scientific NotationAnswers1. 2.75 × 10 4 2. 789,000595
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