Basic Technical Mathematics
11th Edition
ISBN: 9780134437705
Author: Washington
Publisher: PEARSON
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Chapter 19.2, Problem 54E
To determine
To explain: The reason why
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1. Matrix Operations
Given:
A = [ 33 ]A-[3-321]
-3
B = [342]B-[3-41-2]
(a) A² A2
Multiply A× A:
-3
=
(3 x 32x-3) (3 x 22 x 1)
| = |[19–63
|-9-3 -6+21] =
A² = 33 33 1-3×3+1x-3) (-3×2+1x1)
[12]A2=[3-321][3-321]=[(3×3+2x-3)(-3×3+1x-3)(3×2+2×1)(-3×2+1×1)]=[9-6-9-36+2-6+1
]=[3-128-5]
(b) | A ||A| Determinant of A
| A | (3 × 1) (2 x-3)=3+ 6 = 9|A|=(3×1)-(2x-3)=3+6=9
(c) Adjoint of A
Swap diagonal elements and change sign of off-diagonals:
A = [33], so adj (A) = |¯²]A=[3-321], so adj(A)=[13–23]
-3
(d) B-¹B-1
First find | B ||B|:
|B | (3x-2)- (1 × -4) = -6 + 4 = −2|B|=(3x-2)-(1x-4)=-6+4=-2
Then the adjoint of B:
adj (B) = [²
3
adj(B)=[-24-13]
Now,
B-1
1
=
|B|
· adj (B) = 1 [²¯¯³¹³] = [2₂ B
0.5
|B-1=|B|1-adj(B)=-21[-24-13]=[1-20.5-1.5]
2.
(a) Matrix Method: Solve
(2x + 3y = 6
(2x-3y=14
{2x+3y=62x-3y=14
Matrix form:
22 33-22
=
[223-3][xy]=[614]
Find inverse of coefficient matrix: Determinant:
| M | (2x-3) - (3 x 2) = -6 -6 = -12|M|=(2x-3)-(3×2)=-6-6=-12
Adjoint:
adj(M) = [3]adj(M)-[-3-2-32]
So…
Let the region R be the area enclosed by the function f(x)= = 3x² and g(x) = 4x. If the region R is the
base of a solid such that each cross section perpendicular to the x-axis is an isosceles right triangle with a
leg in the region R, find the volume of the solid. You may use a calculator and round to the nearest
thousandth.
y
11
10
9
00
8
7
9
5
4
3
2
1
-1
-1
x
1
2
Using the accompanying Accounting Professionals data to answer the following questions.
a. Find and interpret a 90% confidence interval for the mean years of service.
b. Find and interpret a 90% confidence interval for the proportion of employees who have a graduate degree.
view the Accounting Professionals data.
Employee Years of Service Graduate Degree?1 26 Y2 8 N3 10 N4 6 N5 23 N6 5 N7 8 Y8 5 N9 26 N10 14 Y11 10 N12 8 Y13 7 Y14 27 N15 16 Y16 17 N17 21 N18 9 Y19 9 N20 9 N
Question content area bottom
Part 1
a. A 90% confidence interval for the mean years of service is
(Use ascending order. Round to two decimal places as needed.)
Chapter 19 Solutions
Basic Technical Mathematics
Ch. 19.1 - Find the 20th term of the arithmetic sequence 2,...Ch. 19.1 - Prob. 2PECh. 19.1 - Prob. 3PECh. 19.1 - Prob. 1ECh. 19.1 - Prob. 2ECh. 19.1 - Prob. 3ECh. 19.1 - Prob. 4ECh. 19.1 - In Exercises 3–6, write the first five terms of...Ch. 19.1 - Prob. 6ECh. 19.1 - Prob. 7E
Ch. 19.1 - Prob. 8ECh. 19.1 - Prob. 9ECh. 19.1 - In Exercises 7–14, find the nth term of the...Ch. 19.1 - Prob. 11ECh. 19.1 - Prob. 12ECh. 19.1 - Prob. 13ECh. 19.1 - Prob. 14ECh. 19.1 - In Exercises 15–18, find the sum of the n terms of...Ch. 19.1 - Prob. 16ECh. 19.1 - Prob. 17ECh. 19.1 - Prob. 18ECh. 19.1 - Prob. 19ECh. 19.1 - Prob. 20ECh. 19.1 - Prob. 21ECh. 19.1 - Prob. 22ECh. 19.1 - Prob. 23ECh. 19.1 - Prob. 24ECh. 19.1 - Prob. 25ECh. 19.1 - Prob. 26ECh. 19.1 - In Exercises 27–56, find the indicated quantities...Ch. 19.1 - Prob. 28ECh. 19.1 - Prob. 29ECh. 19.1 - Prob. 30ECh. 19.1 - In Exercises 27–56, find the indicated quantities...Ch. 19.1 - Prob. 32ECh. 19.1 - Prob. 33ECh. 19.1 - Prob. 34ECh. 19.1 - Prob. 35ECh. 19.1 - Prob. 36ECh. 19.1 - Prob. 37ECh. 19.1 - Prob. 38ECh. 19.1 - Prob. 39ECh. 19.1 - Prob. 40ECh. 19.1 - Prob. 41ECh. 19.1 - In Exercises 27–56, find the indicated quantities...Ch. 19.1 - Prob. 43ECh. 19.1 - In Exercises 27–56, find the indicated quantities...Ch. 19.1 - Prob. 45ECh. 19.1 - Prob. 46ECh. 19.1 - Prob. 47ECh. 19.1 - Prob. 48ECh. 19.1 - In Exercises 27–56, find the indicated quantities...Ch. 19.1 - Prob. 50ECh. 19.1 - Prob. 51ECh. 19.1 -
In Exercises 27–56, find the indicated quantities...Ch. 19.1 - Prob. 53ECh. 19.1 - Prob. 54ECh. 19.1 - Prob. 55ECh. 19.1 - Prob. 56ECh. 19.2 -
Find the sixth term of the geometric sequence 8,...Ch. 19.2 - Prob. 2PECh. 19.2 - Prob. 3PECh. 19.2 - Prob. 1ECh. 19.2 - Prob. 2ECh. 19.2 - Prob. 3ECh. 19.2 - Prob. 4ECh. 19.2 - Prob. 5ECh. 19.2 - Prob. 6ECh. 19.2 - Prob. 7ECh. 19.2 - Prob. 8ECh. 19.2 - Prob. 9ECh. 19.2 - Prob. 10ECh. 19.2 - Prob. 11ECh. 19.2 - Prob. 12ECh. 19.2 - Prob. 13ECh. 19.2 - Prob. 14ECh. 19.2 - In Exercises 15–20, find the sum of the first n...Ch. 19.2 - Prob. 16ECh. 19.2 - Prob. 17ECh. 19.2 - Prob. 18ECh. 19.2 - Prob. 19ECh. 19.2 - Prob. 20ECh. 19.2 - Prob. 21ECh. 19.2 - Prob. 22ECh. 19.2 -
In Exercises 21–28, find any of the values of a1,...Ch. 19.2 - Prob. 24ECh. 19.2 -
In Exercises 21–28, find any of the values of a1,...Ch. 19.2 - Prob. 26ECh. 19.2 - Prob. 27ECh. 19.2 - Prob. 28ECh. 19.2 - Prob. 29ECh. 19.2 - Prob. 30ECh. 19.2 - Prob. 31ECh. 19.2 - Prob. 32ECh. 19.2 - Prob. 33ECh. 19.2 - Prob. 34ECh. 19.2 - Prob. 35ECh. 19.2 - Prob. 36ECh. 19.2 - Prob. 37ECh. 19.2 - Prob. 38ECh. 19.2 - Prob. 39ECh. 19.2 - Prob. 40ECh. 19.2 - Prob. 41ECh. 19.2 - Prob. 42ECh. 19.2 - Prob. 43ECh. 19.2 - Prob. 44ECh. 19.2 - Prob. 45ECh. 19.2 - Prob. 46ECh. 19.2 - Prob. 47ECh. 19.2 - Prob. 48ECh. 19.2 - Prob. 49ECh. 19.2 - Prob. 50ECh. 19.2 -
In Exercises 29–56, find the indicated...Ch. 19.2 - Prob. 52ECh. 19.2 -
In Exercises 29–56, find the indicated...Ch. 19.2 - Prob. 54ECh. 19.2 -
In Exercises 29–56, find the indicated...Ch. 19.2 - Prob. 56ECh. 19.3 - Prob. 1PECh. 19.3 - Prob. 2PECh. 19.3 - Prob. 3PECh. 19.3 - Prob. 1ECh. 19.3 - Prob. 2ECh. 19.3 - Prob. 3ECh. 19.3 - Prob. 4ECh. 19.3 - Prob. 5ECh. 19.3 - Prob. 6ECh. 19.3 - Prob. 7ECh. 19.3 - Prob. 8ECh. 19.3 - Prob. 9ECh. 19.3 - Prob. 10ECh. 19.3 - Prob. 11ECh. 19.3 - Prob. 12ECh. 19.3 - Prob. 13ECh. 19.3 - Prob. 14ECh. 19.3 - Prob. 15ECh. 19.3 - Prob. 16ECh. 19.3 - Prob. 17ECh. 19.3 - Prob. 18ECh. 19.3 - In Exercises 15–24, find the fractions equal to...Ch. 19.3 - In Exercises 15–24, find the fractions equal to...Ch. 19.3 - Prob. 21ECh. 19.3 - Prob. 22ECh. 19.3 - Prob. 23ECh. 19.3 - Prob. 24ECh. 19.3 - Prob. 25ECh. 19.3 - Prob. 26ECh. 19.3 - Prob. 27ECh. 19.3 - In Exercises 25–36, solve the given problems by...Ch. 19.3 - Prob. 29ECh. 19.3 - Prob. 30ECh. 19.3 - Prob. 31ECh. 19.3 - Prob. 32ECh. 19.3 - Prob. 33ECh. 19.3 - Prob. 34ECh. 19.3 - Prob. 35ECh. 19.3 - Prob. 36ECh. 19.4 - Prob. 1PECh. 19.4 - Prob. 2PECh. 19.4 - Prob. 3PECh. 19.4 - Prob. 4PECh. 19.4 - Prob. 1ECh. 19.4 - Prob. 2ECh. 19.4 - Prob. 3ECh. 19.4 - Prob. 4ECh. 19.4 - Prob. 5ECh. 19.4 - Prob. 6ECh. 19.4 - Prob. 7ECh. 19.4 - Prob. 8ECh. 19.4 - Prob. 9ECh. 19.4 - Prob. 10ECh. 19.4 - Prob. 11ECh. 19.4 - Prob. 12ECh. 19.4 - Prob. 13ECh. 19.4 - Prob. 14ECh. 19.4 - Prob. 15ECh. 19.4 - Prob. 16ECh. 19.4 - Prob. 17ECh. 19.4 - Prob. 18ECh. 19.4 - Prob. 19ECh. 19.4 - Prob. 20ECh. 19.4 - Prob. 21ECh. 19.4 - Prob. 22ECh. 19.4 - Prob. 23ECh. 19.4 - Prob. 24ECh. 19.4 - Prob. 25ECh. 19.4 - Prob. 26ECh. 19.4 - Prob. 27ECh. 19.4 - Prob. 28ECh. 19.4 - Prob. 29ECh. 19.4 - Prob. 30ECh. 19.4 - Prob. 31ECh. 19.4 - Prob. 32ECh. 19.4 - Prob. 33ECh. 19.4 - Prob. 34ECh. 19.4 - Prob. 35ECh. 19.4 - Prob. 36ECh. 19.4 - Prob. 37ECh. 19.4 - Prob. 38ECh. 19.4 - Prob. 39ECh. 19.4 - Prob. 40ECh. 19.4 - Prob. 41ECh. 19.4 - Prob. 42ECh. 19.4 - Prob. 43ECh. 19.4 - Prob. 44ECh. 19.4 - Prob. 45ECh. 19.4 - Prob. 46ECh. 19.4 - Prob. 47ECh. 19.4 - Prob. 48ECh. 19.4 - Prob. 49ECh. 19.4 - Prob. 50ECh. 19.4 - Prob. 51ECh. 19.4 - Prob. 52ECh. 19.4 - Prob. 53ECh. 19.4 - Prob. 54ECh. 19.4 - Prob. 55ECh. 19.4 - Prob. 56ECh. 19.4 - In Exercises 45–58, solve the given problems.
57....Ch. 19.4 - Prob. 58ECh. 19 - Prob. 1RECh. 19 - Prob. 2RECh. 19 - Prob. 3RECh. 19 - Prob. 4RECh. 19 - Prob. 5RECh. 19 - Prob. 6RECh. 19 - Prob. 7RECh. 19 - Prob. 8RECh. 19 - Prob. 9RECh. 19 - Prob. 10RECh. 19 - Prob. 11RECh. 19 - Prob. 12RECh. 19 - Prob. 13RECh. 19 - Prob. 14RECh. 19 - Prob. 15RECh. 19 - Prob. 16RECh. 19 - Prob. 17RECh. 19 - Prob. 18RECh. 19 - Prob. 19RECh. 19 - Prob. 20RECh. 19 - Prob. 21RECh. 19 - Prob. 22RECh. 19 - Prob. 23RECh. 19 - Prob. 24RECh. 19 - Prob. 25RECh. 19 - Prob. 26RECh. 19 - Prob. 27RECh. 19 - Prob. 28RECh. 19 - In Exercises 27–30, find the sums of the given...Ch. 19 - Prob. 30RECh. 19 - Prob. 31RECh. 19 - Prob. 32RECh. 19 - In Exercises 31–34, find the fractions equal to...Ch. 19 - Prob. 34RECh. 19 - Prob. 35RECh. 19 - Prob. 36RECh. 19 - Prob. 37RECh. 19 - Prob. 38RECh. 19 - Prob. 39RECh. 19 - Prob. 40RECh. 19 - Prob. 41RECh. 19 - Prob. 42RECh. 19 - Prob. 43RECh. 19 - Prob. 44RECh. 19 - Prob. 45RECh. 19 - Prob. 46RECh. 19 - Prob. 47RECh. 19 - Prob. 48RECh. 19 - Prob. 49RECh. 19 - Prob. 50RECh. 19 - Prob. 51RECh. 19 - Prob. 52RECh. 19 - Prob. 53RECh. 19 - Prob. 54RECh. 19 - Prob. 55RECh. 19 - Prob. 56RECh. 19 - Prob. 57RECh. 19 - Prob. 58RECh. 19 - Prob. 59RECh. 19 - Prob. 60RECh. 19 - Prob. 61RECh. 19 - Prob. 62RECh. 19 - Prob. 63RECh. 19 - Prob. 64RECh. 19 - Prob. 65RECh. 19 - Prob. 66RECh. 19 - Prob. 67RECh. 19 - Prob. 68RECh. 19 - In Exercises 51–98, solve the given problems by...Ch. 19 - Prob. 70RECh. 19 - Prob. 71RECh. 19 - Prob. 72RECh. 19 - Prob. 73RECh. 19 - Prob. 74RECh. 19 - Prob. 75RECh. 19 - Prob. 76RECh. 19 - Prob. 77RECh. 19 - Prob. 78RECh. 19 - Prob. 79RECh. 19 - Prob. 80RECh. 19 - In Exercises 51–98, solve the given problems by...Ch. 19 - Prob. 82RECh. 19 - Prob. 83RECh. 19 - Prob. 84RECh. 19 - Prob. 85RECh. 19 - Prob. 86RECh. 19 - Prob. 87RECh. 19 - Prob. 88RECh. 19 - In Exercises 51–98, solve the given problems by...Ch. 19 - Prob. 90RECh. 19 - Prob. 91RECh. 19 - Prob. 92RECh. 19 - Prob. 93RECh. 19 - Prob. 94RECh. 19 - Prob. 95RECh. 19 - Prob. 96RECh. 19 - Prob. 97RECh. 19 - Prob. 98RECh. 19 - Prob. 99RECh. 19 - Prob. 1PTCh. 19 - Prob. 2PTCh. 19 - Prob. 3PTCh. 19 - Prob. 4PTCh. 19 - Prob. 5PTCh. 19 - Prob. 6PTCh. 19 - Prob. 7PTCh. 19 - Prob. 8PTCh. 19 - Prob. 9PT
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