14139[1] basic math & algebra

8/7/2019 14139[1] Basic Math & Algebra

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DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

NONRESIDENTTRAINING

COURSE

Mathematics, Basic Math and

AlgebraNAVEDTRA 14139

Notice: NETPDTC is no longer responsible for the content accuracy of theNRTCs.

For content issues, contact the servicing Center of Excellence: Center forSubmarine Learning (SLC); (860) 694-1716, Ext. 1728 or DSN: 694-1716, Ext.

1728.


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DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

PREFACE

About this course:

This is a self-study course. By studying this course, you can improve your professional/military knowledge,

as well as prepare for the Navywide advancement-in-rate examination. It contains subject matter supportingday-to-day occupational knowledge and skill requirements and includes text, tables, and illustrations to help

you understand the information.

History of the course:

June 1980: Original edition released.

June 1985: Reprinted.

pr 2003: Administrative update released. Technical content was not reviewed or revised.

NOTE

In the assignment portion of this course, a question with no answer choices given is a True/Falsequestion. For True/False questions, answer 1 for True and 2 for False.

NAVSUP Logistics Tracking Number0504-LP-026-7940


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CONTENTSCHAPTER PAGE

1 Number systems and sets ....................................................................................... 1

2 Positive integers ..................................................................................................... 7

3 Signed numbers...................................................................................................... 19

4 Common fractions.................................................................................................. 285 Decimals................................................................................................................. 45

6 Percentage and measurement ................................................................................. 55

7 Exponents and radicals........................................................................................... 65

8 Logarithms and the slide rule................................................................................. 80

9 Fundamentals of algebra ........................................................................................ 98

10 Factoring polynomials............................................................................................ 11111 Linear equations in one variable ............................................................................ 120

12 Linear equations in two variables........................................................................... 130

13 Ratio, proportion, and variation ............................................................................. 141

14 Dependence, functions, and formulas .................................................................... 151

15 Complex numbers .................................................................................................. 158

16 Quadratic equations in one variable....................................................................... 16717 Plane figures........................................................................................................... 181

18 Geometric constructions and solid figures ............................................................. 190

19 Numerical trigonometry......................................................................................... 199

APPENDIX

I Squares, cubes, square roots, cube roots, logarithms, and reciprocals of numbers 210

II Natural sines, cosines, and tangents of angles from 0 to 90 ................................... 213

III Mathematical symbols............................................................................................... 219

IV Weights and measures ............................................................................................... 220

V Formulas.................................................................................................................... 221INDEX .............................................................................................................................. INDEX 222

ASSIGNMENT QUESTIONS follow index.


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MATHEMATICS, VOLUME 1

Figure 5-1.Place values including decimals.

Figure 5-2.Conversionof a decimal fractionto shortened form.

are zeros in the denominator of the fractionalform.

Figure 5-3 shows the fraction 24358 and100000

what is meant when it is changed to the short-ened form. This figure is presented to showfurther that each digit of a decimal fractionholds a certain position in the digit sequenceand has a particular value.

By the fundamental rule of fractions, it

should be clear that 550 500

= = . Writing10 100 1000

the same values in the shortened way, we have0.5 = 0.50 = 0.500. In other words, the value ofa decimal is not changed by annexing zeros atthe right-hand end of the number. This is not

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Figure 5-3.Steps in the conversion of adecimal fraction to shortened form.

true of whole numbers. Thus, 0.3, 0.30, and0.300 are equal but 3, 30, and 300 are not equal.Also notice that zeros directly after the deci-mal point do change values. Thus 0.3 is notequal to either 0.03 or 0.003.

Decimals such as 0.125 are frequently seen.Although the 0 on the left of the decimal pointis not required, it is often helpful. This is par-

ticularlytrue in an expression such as 32 0.1.In this expression, the lower dot of the divisionsymbol must not be crowded against the decimalpoint; the 0 serves as an effective spacer. Ifany doubt exists concerning the clarity of anexpression such as .125, it should be written as0.125.


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MATHEMATICS. VOLUME 1

0.2000.0250.002

0.227

Figure 6-1.(A) Parts of a micrometer;(B) micrometer scales.

of an inch. Multiplying times 0.025 inch, we

find that each marking on the thimble repre-sents 0.001 inch.

0.025 inch since1

is equal to 0.025. The40

sleeve has 40 markings to the inch. Thus eachspace between the markings on the sleeve isalso 0.025 inch. Since 4 such spaces are 0.1inch (that is, 4 x 0.025), every fourth mark islabeled in tenths of an inch for convenience inreading. Thus, 4 marks equal 0.1 inch, 8 marksequal 0.2 inch, 12 marks equal 0.3 inch, etc.

To enable measurement of a partial turn,the beveled edge of the thimble is divided into25 equal parts. Thus each marking on the

thimble is1

of a complete turn, or1

of1

25 25 401

25

READING THE MICROMETER

It is sometimes convenient when learning toread a micrometer to writedown the component

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parts of the measurement as read on the scalesand then to add them. For example, in figure6-1 (B) there are two major divisions visible(0.2 inch). One minor division is showingclearly (0.025 inch). The marking on the thimblenearest the horizontal or index line of the sleeve

is the second marking (0.002 inch). Addingthese parts, we have

Thus, the reading is 0.227 inch. As explainedpreviously, this is read verbally as "two hun-dred twenty-seven thousandths." A more skill-ful method of reading the scales is to read alldigits as thousandths directly and to do anyadding mentally. Thus, we read the major divi-sion on the scale as two hundred thousandthsand the minor division is added on mentally.The mental process for the above setting thenwould be two hundred twenty-five; two hundredtwenty-seven thousandths.

Practice problems:

1. Read each of the micrometer settings shownin figure 6-2.

Figure 6-2.Micrometer settings.


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MATHEMATICS, VOLUME 1

The foregoing example could be followedthrough for any distance between markings.Suppose the 0 mark fell seven tenths of the dis-tance between ruler markings. It would takeseven vernier markings, a loss of one-hundredthof an inch each time, to bring the marks in lineat 7 on the vernier.

The vernier principle may be used to getfine linear readings, angular readings, etc.The principle is always the same. The vernierhas one more marking than the number of mark-ings on an equal space of the conventional scaleof the measuring instrument. For example, thevernier caliper (fig. 6-5) has 25 markings onthe vernier for 24 on the caliper scale. Thecaliper is marked off to read to fortieths (0.025)of an inch, and the vernier extends the accuracyto a thousandth of an inch.

0.30000.07500.00800.0004

0.3834

Figure 6-5.A vernier caliper.

Vernier Micrometer

By adding a vernier to the micrometer, it is

possible to read accurately to one ten-thousandthof an inch. The vernier markings are on thesleeve of the micrometer and are parallel tothe thimble markings. There are 10 divisionson the vernier that occupy the same space as 9divisions on the thimble. Since a thimble spaceis one thousandth of an inch, a vernier space is1

of9

inch, or9

inch. It is1

inch10 1000 10000 10000

less than a thimble space. Thus, as in the pre-ceding explanation of verniers, it is possible toread the nearest ten-thousandth of an inch byreading the vernier digit whose marking coin-cides with a thimble marking.

In figure 6-6 (A), the last major divisionshowing fully on the sleeve index is 3. Thethird minor division is the last mark clearly

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showing (0.075). The thimble division nearestand below the index is the 8 (0.008). The ver-nier marking that matches a thimble markingis the fourth (0.0004). Adding them all together,we have,

The reading is 0.3834 inch. With practice thesereadings can be made directly from the microm-eter, without writing the partial readings.

Figure 6-6.Vernier micrometer settings.

Practice problems:

1. Read the micrometer settings in figure 6-6.

Answers:

1. (A) See the foregoing example.

(B) 0.1539 (E) 0.4690

(C) 0.2507 (F) 0.0552

(D) 0.2500


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1-64. The product, in simp lif ied fo rm, of themultiplication, problem; 4 (2 hours22 minutes 32 seconds) is1. 8 hours 88 minutes 128 seconds

2. 8 hours 90 minutes 8 seconds3. 9 hours 28 minutes 8 seconds4. 9 hours 30 minutes 8 seconds

1-65. The product of 12 miles and 13 miles is

1. 156 miles2. mi les3. 156 milessquare4. 156

1-66. The product of 2 feet 8 inches times3 feet 4 inches may be found by1. mul t ip ly ing 2- feet t imes 3 feet then

multiplying 8 inches times 4 inches2. multiplying 3 feet times 2 feet 8

inches then multiplying 4 inches times2 feet 8 inches

3. converting 2 feet 8 inches to 2 feet23

and 3 feet 4 inches to 3then mult ip ly ing

1 fee t and3

4. changing 2 feet 8 inches to 3 feet and3 feet 4 inches to 4 feet and thenmul t ip ly ing

1-67. If a pipe 22 feet 6 inches long is cut into3 equal l engths, how long are the pieces?(Neglect the width of the saw cuts.)1. 7 feet 1 inch2. 7 feet 3 inches3. 7 feet 4 inches4. 7 feet 6 inches

1-68. The result of dividing 23 hours 31 minutes20 seconds by 5 is

1. 43 hours 6 minutes 4 seconds1

52. 4 hours 0 minutes 4224 seconds3. 4 hours 42 minutes 16 seconds4. 4 hours 6 minutes 4 seconds

1-69. In which of the following series ofoperations is the order in which theoperations are performed important?l . 2 + 3 + 5

2. (3) (9) (7)3. 6 x 8 x 94. 48 6 x 3

1-70. The answer to the problem 24 4 3 2i s1. not defined2. 13. 4

4. 9

1-71. The order of operations is important ifdivision or mult ipl icat ion is involvedwith other operations, Use the rulespertaining to a series of mixed operationsto calculate the value of 6 x 4 + 8 2.

1. 162. 28

3. 364. 48

1-72. The number 36 is a multiple of1, 2, 3, 4, 6, 9, 18, 36, and1. 102. 11

3. 124. 13

1-73. An odd number when divided by 2 producesa remainder of 1.

1-74. The number 7 is a factor of

l . 112. 17

3. 24

4. 35

1-75. What is the value of x if x = (3)(0)(4)(6)?l . 02. 18

3. 24

4. 72

11


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Assignment 7

Fundamentals of Algebra; Factoring Polynomials

Textbook Assignment: Chapters 9, 10 (111-117)

7-1. The literal numbers a, x, and p are moregeneral than the numbers 9, 8, and 7.

7-2. The commutative law for addition is il-lustrated by the equation1. ab = ba2. a + a = b + b3. a + b = b + a4. a(b + c) = ab + ac

7-3. The associat ive law of mult ipl icat ion isi l lustrated by the equation1. abc = acb = cba2. a x (b + c) = c x (b + a)3 . a (b + c + d) = ab + ac + ad4. a (bc) = abc = (ab)c

7-4. If a = 2, b = -3, and c = 4, the algebraicsum of a - b - c equals

1. -52. 13 . 34. 9

7-5. If r = 1, s = 3, t = 12, and x = 15, whatis the value of the expression

2rx?t -

s

1. - 3 3. 22. - 2 4. 3

7-6. The algebraic expression

is considered to be three numbers.

7-7. What is the value of the algebraic ex-pression

5x2 - 2xy + (3x)

2

when x = 2 and y = -3?1 . 442. 683. 1244. 14 8

7-8. What name is given to the algebraic ex-pression ax - 2 bx + cx

2- 4?

1. Monomial2. Binomial3 . T r inomia l4. Polynomial

7-9. Which statement is true regarding themonomial 17xyz?1. 17 is the c oe f f ic ien t o f x yz .2. 17x is the coef f ic ient of yz.3 . 17xy is the coe f f ic ien t o f z .4. Each of the above is a true statement.

7-10. In the expression xy, what is the co-e f f i c ien t o f xy?1. 12. x

3. y

4 . x y

7-11. What is the coef f ic ient of x 2y in theexpression x

2y - ab?

1. 12. 23. x

2

4. y

7-1 2 . Two terms of an expression are said to bel ike i f they con ta in1. at least one factor in common2. the same numerical coefficient3. the same l i tera l factors with only

their exponents d i f ferent4. the same l i teral factors raised to the

same powers

7- 13 . The like terms in the expression

2 ac2

- 2bc2

+ ac2

- 2c2

are

1. 2ac2

and 2bc2

2. 2ac2

and ac2

3. 2ac2

and 2c2

4. 2bc2 and 2c2

40


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14139[1] basic math & algebra

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