Algebra and Trigonometry with Analytic Geometry, Classic Edition
12th Edition
ISBN: 9780495559719
Author: Earl Swokowski, Jeffery A. Cole
Publisher: Cengage Learning
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Chapter 2.6, Problem 81E
To determine
To find: distance object be placed from the lens so that its image appears at least three times as large.
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Chapter 2 Solutions
Algebra and Trigonometry with Analytic Geometry, Classic Edition
Ch. 2.1 - Exer. 144: Solve the equation. 1. 3x+4=1Ch. 2.1 - Exer. 144: Solve the equation. 2. 2x2=9Ch. 2.1 - Exer. 144: Solve the equation. 3. 4x3=5x+6Ch. 2.1 - Prob. 4ECh. 2.1 - Exer. 144: Solve the equation. 5. 4(2y+5)=3(5y2)Ch. 2.1 - Prob. 6ECh. 2.1 - Exer. 144 : Solve the equation. 7. 15x+2=327xCh. 2.1 - Exer. 144: Solve the equation. 8. 53x1=4+23xCh. 2.1 - Prob. 9ECh. 2.1 - Exer. 144: Solve the equation. 10....
Ch. 2.1 - Prob. 11ECh. 2.1 - Prob. 12ECh. 2.1 - Prob. 13ECh. 2.1 - Prob. 14ECh. 2.1 - Prob. 15ECh. 2.1 - Exer. 144: Solve the equation. 16. 3y+6y1y=11Ch. 2.1 - Prob. 17ECh. 2.1 - Prob. 18ECh. 2.1 - Prob. 19ECh. 2.1 - Prob. 20ECh. 2.1 - Prob. 21ECh. 2.1 - Prob. 22ECh. 2.1 - Prob. 23ECh. 2.1 - Prob. 24ECh. 2.1 - Prob. 25ECh. 2.1 - Prob. 26ECh. 2.1 - Prob. 27ECh. 2.1 - Prob. 28ECh. 2.1 - Prob. 29ECh. 2.1 - Prob. 30ECh. 2.1 - Prob. 31ECh. 2.1 - Prob. 32ECh. 2.1 - Prob. 33ECh. 2.1 - Prob. 34ECh. 2.1 - Prob. 35ECh. 2.1 - Prob. 36ECh. 2.1 - Prob. 37ECh. 2.1 - Prob. 38ECh. 2.1 - Prob. 39ECh. 2.1 - Prob. 40ECh. 2.1 - Prob. 41ECh. 2.1 - Prob. 42ECh. 2.1 - Prob. 43ECh. 2.1 - Prob. 44ECh. 2.1 - Prob. 45ECh. 2.1 - Prob. 46ECh. 2.1 - Prob. 47ECh. 2.1 - Prob. 48ECh. 2.1 - Prob. 49ECh. 2.1 - Prob. 50ECh. 2.1 - Prob. 51ECh. 2.1 - Prob. 52ECh. 2.1 - Prob. 53ECh. 2.1 - Prob. 54ECh. 2.1 - Prob. 55ECh. 2.1 - Prob. 56ECh. 2.1 - Exer. 57-58: Determine which equation is not...Ch. 2.1 - Prob. 58ECh. 2.1 - Exer. 5962: Solve the formula for the specified...Ch. 2.1 - Prob. 60ECh. 2.1 - Prob. 61ECh. 2.1 - Prob. 62ECh. 2.1 - Prob. 63ECh. 2.1 - Prob. 64ECh. 2.1 - Prob. 65ECh. 2.1 - Exer. 6376: The formula occurs in the indicated...Ch. 2.1 - Prob. 67ECh. 2.1 - Prob. 68ECh. 2.1 - Prob. 69ECh. 2.1 - Prob. 70ECh. 2.1 - Prob. 71ECh. 2.1 - Prob. 72ECh. 2.1 - Prob. 73ECh. 2.1 - Prob. 74ECh. 2.1 - Prob. 75ECh. 2.1 - Prob. 76ECh. 2.2 - Test scores A student in an algebra course has...Ch. 2.2 - Final class average Before the final exam, a...Ch. 2.2 - Gross pay A worker's take-home pay is $492, after...Ch. 2.2 - Cost of dining out A couple does not wish to spend...Ch. 2.2 - Intelligence quotient A person's intelligence...Ch. 2.2 - Earth's surface area Water covers 70.8, or about...Ch. 2.2 - Cost of insulation The cost of installing...Ch. 2.2 - Overtime pay A workman's basic hourly wage is $10,...Ch. 2.2 - Prob. 9ECh. 2.2 - Prob. 10ECh. 2.2 - Movie attendance Six hundred people attended the...Ch. 2.2 - Hourly pay A consulting engineer's time is billed...Ch. 2.2 - Preparing a glucose solution In a certain medical...Ch. 2.2 - Preparing eye drops A pharmacist is to prepare 15...Ch. 2.2 - Preparing an alloy British sterling silver is a...Ch. 2.2 - Drug concentration Theophylline, an asthma...Ch. 2.2 - Walking rates Two children, who are 224 meters...Ch. 2.2 - Running rates A runner starts at the beginning of...Ch. 2.2 - Snowplow speed At 6 A.M. a snowplow, traveling at...Ch. 2.2 - Two-way radio range Two children own two-way...Ch. 2.2 - Prob. 21ECh. 2.2 - Prob. 22ECh. 2.2 - Distance to a target A bullet is fired...Ch. 2.2 - Prob. 24ECh. 2.2 - Prob. 25ECh. 2.2 - House dimensions Shown in the figure is a cross...Ch. 2.2 - Window dimensions A stained-glass window is being...Ch. 2.2 - Prob. 28ECh. 2.2 - Prob. 29ECh. 2.2 - Prob. 30ECh. 2.2 - Lawn mowing rates It takes a boy 90 minutes to mow...Ch. 2.2 - Prob. 32ECh. 2.2 - Prob. 33ECh. 2.2 - Prob. 34ECh. 2.2 - Prob. 35ECh. 2.2 - Prob. 36ECh. 2.2 - Prob. 37ECh. 2.2 - Prob. 38ECh. 2.2 - Prob. 39ECh. 2.2 - Prob. 40ECh. 2.3 - Exer. 114: Solve the equation by factoring. 16....Ch. 2.3 - Exer. 114: Solve the equation by factoring. 24....Ch. 2.3 - Exer. 114: Solve the equation by factoring. 31....Ch. 2.3 - Exer. 114: Solve the equation by factoring. 4....Ch. 2.3 - Exer. 114: Solve the equation by factoring. 5....Ch. 2.3 - Exer. 114: Solve the equation by factoring. 6....Ch. 2.3 - Exer. 114: Solve the equation by factoring. 7....Ch. 2.3 - Exer. 114: Solve the equation by factoring. 8....Ch. 2.3 - Exer. 114: Solve the equation by factoring. 9....Ch. 2.3 - Exer. 114 : Solve the equation by factoring. 10 ....Ch. 2.3 - Exer. 114: Solve the equation by factoring. 11....Ch. 2.3 - Prob. 12ECh. 2.3 - Exer. 114: Solve the equation by factoring. 13....Ch. 2.3 - Prob. 14ECh. 2.3 - Prob. 15ECh. 2.3 - Exer. 1516: Determine whether the two equations...Ch. 2.3 - Exer. 1724: Solve the equation by using the...Ch. 2.3 - Exer. 1724: Solve the equation by using the...Ch. 2.3 - Exer. 1724 : Solve the equation by using the...Ch. 2.3 - Prob. 20ECh. 2.3 - Exer. 1724: Solve the equation by using the...Ch. 2.3 - Prob. 22ECh. 2.3 - Exer. 1724 : Solve the equation by using the...Ch. 2.3 - Exer. 1724: Solve the equation by using the...Ch. 2.3 - Prob. 25ECh. 2.3 - Prob. 26ECh. 2.3 - Exer. 2730: Solve by completing the square. (Note:...Ch. 2.3 - Prob. 28ECh. 2.3 - Prob. 29ECh. 2.3 - Prob. 30ECh. 2.3 - Prob. 31ECh. 2.3 - Prob. 32ECh. 2.3 - Prob. 33ECh. 2.3 - Prob. 34ECh. 2.3 - Prob. 35ECh. 2.3 - Prob. 36ECh. 2.3 - Prob. 37ECh. 2.3 - Prob. 38ECh. 2.3 - Prob. 39ECh. 2.3 - Prob. 40ECh. 2.3 - Prob. 41ECh. 2.3 - Prob. 42ECh. 2.3 - Prob. 43ECh. 2.3 - Prob. 44ECh. 2.3 - Prob. 45ECh. 2.3 - Exer. 4548: Use the quadratic formula to factor...Ch. 2.3 - Prob. 47ECh. 2.3 - Prob. 48ECh. 2.3 - Prob. 49ECh. 2.3 - Prob. 50ECh. 2.3 - Exer. 5154: Solve for the specified variable. 51....Ch. 2.3 - Prob. 52ECh. 2.3 - Prob. 53ECh. 2.3 - Prob. 54ECh. 2.3 - Prob. 55ECh. 2.3 - Prob. 56ECh. 2.3 - Prob. 57ECh. 2.3 - Prob. 58ECh. 2.3 - Prob. 59ECh. 2.3 - Prob. 60ECh. 2.3 - Prob. 61ECh. 2.3 - Prob. 62ECh. 2.3 - Prob. 63ECh. 2.3 - Prob. 64ECh. 2.3 - Fencing a garden A square vegetable garden is to...Ch. 2.3 - Prob. 66ECh. 2.3 - Prob. 67ECh. 2.3 - Prob. 68ECh. 2.3 - Prob. 69ECh. 2.3 - Prob. 70ECh. 2.3 - Prob. 71ECh. 2.3 - Prob. 72ECh. 2.3 - Prob. 73ECh. 2.3 - Prob. 74ECh. 2.3 - Prob. 75ECh. 2.3 - Prob. 76ECh. 2.3 - Prob. 77ECh. 2.3 - Dimensions of a vitamin tablet The rate at which a...Ch. 2.3 - Prob. 79ECh. 2.3 - Exer. 7980: During a nuclear explosion, a fireball...Ch. 2.3 - Prob. 81ECh. 2.3 - Prob. 82ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 3ECh. 2.4 - Prob. 4ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 8ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 10ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 12ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 14ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 16ECh. 2.4 - Prob. 17ECh. 2.4 - Prob. 18ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 20ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 22ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 24ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 26ECh. 2.4 - Exer. 134: Write the expression in the form a+bi,...Ch. 2.4 - Prob. 28ECh. 2.4 - Prob. 29ECh. 2.4 - Prob. 30ECh. 2.4 - Prob. 31ECh. 2.4 - Prob. 32ECh. 2.4 - Prob. 33ECh. 2.4 - Prob. 34ECh. 2.4 - Prob. 35ECh. 2.4 - Prob. 36ECh. 2.4 - Prob. 37ECh. 2.4 - Prob. 38ECh. 2.4 - Prob. 39ECh. 2.4 - Prob. 40ECh. 2.4 - Prob. 41ECh. 2.4 - Prob. 42ECh. 2.4 - Prob. 43ECh. 2.4 - Prob. 44ECh. 2.4 - Prob. 45ECh. 2.4 - Prob. 46ECh. 2.4 - Prob. 47ECh. 2.4 - Prob. 48ECh. 2.4 - Prob. 49ECh. 2.4 - Prob. 50ECh. 2.4 - Prob. 51ECh. 2.4 - Prob. 52ECh. 2.4 - Prob. 53ECh. 2.4 - Prob. 54ECh. 2.4 - Prob. 55ECh. 2.4 - Prob. 56ECh. 2.4 - Prob. 57ECh. 2.4 - Prob. 58ECh. 2.4 - Prob. 59ECh. 2.4 - Prob. 60ECh. 2.4 - Prob. 61ECh. 2.4 - Prob. 62ECh. 2.5 - Exer. 150: Solve the equation. 1. x+4=11Ch. 2.5 - Exer. 150: Solve the equation. 2. x5=2Ch. 2.5 - Exer. 150: Solve the equation. 3. 3x2+3=7Ch. 2.5 - Exer. 150: Solve the equation. 4. 2 5x+21=5Ch. 2.5 - Exer. 150: Solve the equation. 5. 3x+12=11Ch. 2.5 - Prob. 6ECh. 2.5 - Prob. 7ECh. 2.5 - Prob. 8ECh. 2.5 - Prob. 9ECh. 2.5 - Prob. 10ECh. 2.5 - Prob. 11ECh. 2.5 - Prob. 12ECh. 2.5 - Prob. 13ECh. 2.5 - Prob. 14ECh. 2.5 - Prob. 15ECh. 2.5 - Prob. 16ECh. 2.5 - Prob. 17ECh. 2.5 - Prob. 18ECh. 2.5 - Prob. 19ECh. 2.5 - Prob. 20ECh. 2.5 - Prob. 21ECh. 2.5 - Prob. 22ECh. 2.5 - Prob. 23ECh. 2.5 - Prob. 24ECh. 2.5 - Prob. 25ECh. 2.5 - Prob. 26ECh. 2.5 - Prob. 27ECh. 2.5 - Prob. 28ECh. 2.5 - Prob. 29ECh. 2.5 - Prob. 30ECh. 2.5 - Prob. 31ECh. 2.5 - Prob. 32ECh. 2.5 - Prob. 33ECh. 2.5 - Prob. 34ECh. 2.5 - Prob. 35ECh. 2.5 - Prob. 36ECh. 2.5 - Prob. 37ECh. 2.5 - Prob. 38ECh. 2.5 - Prob. 39ECh. 2.5 - Prob. 40ECh. 2.5 - Prob. 41ECh. 2.5 - Prob. 42ECh. 2.5 - Prob. 43ECh. 2.5 - Prob. 44ECh. 2.5 - Prob. 45ECh. 2.5 - Prob. 46ECh. 2.5 - Prob. 47ECh. 2.5 - Prob. 48ECh. 2.5 - Prob. 49ECh. 2.5 - Prob. 50ECh. 2.5 - Prob. 51ECh. 2.5 - Prob. 52ECh. 2.5 - Prob. 53ECh. 2.5 - Prob. 54ECh. 2.5 - Prob. 55ECh. 2.5 - Prob. 56ECh. 2.5 - Ladder height The recommended distance d that a...Ch. 2.5 - Prob. 58ECh. 2.5 - Windmill power The power P (in watts) generated by...Ch. 2.5 - Prob. 60ECh. 2.5 - Prob. 61ECh. 2.5 - Prob. 62ECh. 2.5 - Prob. 63ECh. 2.5 - Inflating a weather balloon The volume of a...Ch. 2.5 - Prob. 65ECh. 2.5 - Prob. 66ECh. 2.5 - Installing a power line A power line is to be...Ch. 2.5 - Prob. 68ECh. 2.6 - Prob. 1ECh. 2.6 - Prob. 2ECh. 2.6 - Prob. 3ECh. 2.6 - Prob. 4ECh. 2.6 - Prob. 5ECh. 2.6 - Prob. 6ECh. 2.6 - Prob. 7ECh. 2.6 - Prob. 8ECh. 2.6 - Prob. 9ECh. 2.6 - Prob. 10ECh. 2.6 - Prob. 11ECh. 2.6 - Prob. 12ECh. 2.6 - Prob. 13ECh. 2.6 - Prob. 14ECh. 2.6 - Prob. 15ECh. 2.6 - Prob. 16ECh. 2.6 - Prob. 17ECh. 2.6 - Prob. 18ECh. 2.6 - Prob. 19ECh. 2.6 - Prob. 20ECh. 2.6 - Prob. 21ECh. 2.6 - Prob. 22ECh. 2.6 - Prob. 23ECh. 2.6 - Prob. 24ECh. 2.6 - Prob. 25ECh. 2.6 - Prob. 26ECh. 2.6 - Prob. 27ECh. 2.6 - Prob. 28ECh. 2.6 - Prob. 29ECh. 2.6 - Prob. 30ECh. 2.6 - Prob. 31ECh. 2.6 - Prob. 32ECh. 2.6 - Prob. 33ECh. 2.6 - Prob. 34ECh. 2.6 - Prob. 35ECh. 2.6 - Prob. 36ECh. 2.6 - Prob. 37ECh. 2.6 - Prob. 38ECh. 2.6 - Prob. 39ECh. 2.6 - Prob. 40ECh. 2.6 - Prob. 41ECh. 2.6 - Prob. 42ECh. 2.6 - Prob. 43ECh. 2.6 - Prob. 44ECh. 2.6 - Prob. 45ECh. 2.6 - Prob. 46ECh. 2.6 - Prob. 47ECh. 2.6 - Prob. 48ECh. 2.6 - Prob. 49ECh. 2.6 - Prob. 50ECh. 2.6 - Prob. 51ECh. 2.6 - Exer. 2170: Solve the inequality, and express the...Ch. 2.6 - Prob. 53ECh. 2.6 - Prob. 54ECh. 2.6 - Prob. 55ECh. 2.6 - Prob. 56ECh. 2.6 - Prob. 57ECh. 2.6 - Prob. 58ECh. 2.6 - Prob. 59ECh. 2.6 - Prob. 60ECh. 2.6 - Prob. 61ECh. 2.6 - Prob. 62ECh. 2.6 - Prob. 63ECh. 2.6 - Prob. 64ECh. 2.6 - Prob. 65ECh. 2.6 - Prob. 66ECh. 2.6 - Prob. 67ECh. 2.6 - Prob. 68ECh. 2.6 - Prob. 69ECh. 2.6 - Prob. 70ECh. 2.6 - Prob. 71ECh. 2.6 - Prob. 72ECh. 2.6 - Prob. 73ECh. 2.6 - Prob. 74ECh. 2.6 - Prob. 75ECh. 2.6 - Prob. 76ECh. 2.6 - Prob. 77ECh. 2.6 - Prob. 78ECh. 2.6 - Prob. 79ECh. 2.6 - Prob. 80ECh. 2.6 - Prob. 81ECh. 2.6 - Prob. 82ECh. 2.6 - Prob. 83ECh. 2.6 - Prob. 84ECh. 2.6 - Prob. 85ECh. 2.7 - Exer. 140: Solve the inequality, and express the...Ch. 2.7 - Prob. 2ECh. 2.7 - Prob. 3ECh. 2.7 - Prob. 4ECh. 2.7 - Prob. 5ECh. 2.7 - Prob. 6ECh. 2.7 - Prob. 7ECh. 2.7 - Prob. 8ECh. 2.7 - Exer. 140: Solve the inequality, and express the...Ch. 2.7 - Prob. 10ECh. 2.7 - Prob. 11ECh. 2.7 - Prob. 12ECh. 2.7 - Prob. 13ECh. 2.7 - Prob. 14ECh. 2.7 - Prob. 15ECh. 2.7 - Prob. 16ECh. 2.7 - Prob. 17ECh. 2.7 - Prob. 18ECh. 2.7 - Prob. 19ECh. 2.7 - Prob. 20ECh. 2.7 - Prob. 21ECh. 2.7 - Prob. 22ECh. 2.7 - Prob. 23ECh. 2.7 - Prob. 24ECh. 2.7 - Prob. 25ECh. 2.7 - Exer. 140: Solve the inequality, and express the...Ch. 2.7 - Prob. 27ECh. 2.7 - Prob. 28ECh. 2.7 - Prob. 29ECh. 2.7 - Prob. 30ECh. 2.7 - Prob. 31ECh. 2.7 - Prob. 32ECh. 2.7 - Prob. 33ECh. 2.7 - Prob. 34ECh. 2.7 - Prob. 35ECh. 2.7 - Prob. 36ECh. 2.7 - Prob. 37ECh. 2.7 - Prob. 38ECh. 2.7 - Prob. 39ECh. 2.7 - Prob. 40ECh. 2.7 - Prob. 41ECh. 2.7 - Prob. 42ECh. 2.7 - Prob. 43ECh. 2.7 - Prob. 44ECh. 2.7 - Prob. 45ECh. 2.7 - Prob. 46ECh. 2.7 - Prob. 47ECh. 2.7 - Prob. 48ECh. 2.7 - Prob. 49ECh. 2.7 - Prob. 50ECh. 2.7 - Prob. 51ECh. 2 - Prob. 1RECh. 2 - Prob. 2RECh. 2 - Prob. 3RECh. 2 - Exer. 124: Solve the equation. 4. 7x26x24=32x+4Ch. 2 - Prob. 5RECh. 2 - Prob. 6RECh. 2 - Prob. 7RECh. 2 - Prob. 8RECh. 2 - Prob. 9RECh. 2 - Prob. 10RECh. 2 - Exer. 124 : Solve the equation. 11. x2/32x1/315=0Ch. 2 - Exer. 124: Solve the equation. 12. 20x3+8x235x14=0Ch. 2 - Prob. 13RECh. 2 - Prob. 14RECh. 2 - Prob. 15RECh. 2 - Prob. 16RECh. 2 - Prob. 17RECh. 2 - Prob. 18RECh. 2 - Prob. 19RECh. 2 - Exer. 124 : Solve the equation. 20. 4x532=0Ch. 2 - Prob. 21RECh. 2 - Prob. 22RECh. 2 - Prob. 23RECh. 2 - Prob. 24RECh. 2 - Prob. 25RECh. 2 - Prob. 26RECh. 2 - Prob. 27RECh. 2 - Prob. 28RECh. 2 - Prob. 29RECh. 2 - Prob. 30RECh. 2 - Prob. 31RECh. 2 - Prob. 32RECh. 2 - Exer. 2744 : Solve the inequality, and express the...Ch. 2 - Prob. 34RECh. 2 - Prob. 35RECh. 2 - Prob. 36RECh. 2 - Prob. 37RECh. 2 - Prob. 38RECh. 2 - Prob. 39RECh. 2 - Prob. 40RECh. 2 - Prob. 41RECh. 2 - Prob. 42RECh. 2 - Prob. 43RECh. 2 - Prob. 44RECh. 2 - Prob. 45RECh. 2 - Prob. 46RECh. 2 - Prob. 47RECh. 2 - Prob. 48RECh. 2 - Prob. 49RECh. 2 - Prob. 50RECh. 2 - Prob. 51RECh. 2 - Prob. 52RECh. 2 - Prob. 53RECh. 2 - Prob. 54RECh. 2 - Prob. 55RECh. 2 - Prob. 56RECh. 2 - Prob. 57RECh. 2 - Prob. 58RECh. 2 - Prob. 59RECh. 2 - Prob. 60RECh. 2 - Prob. 61RECh. 2 - Prob. 62RECh. 2 - Prob. 63RECh. 2 - Prob. 64RECh. 2 - Prob. 65RECh. 2 - Prob. 66RECh. 2 - Prob. 67RECh. 2 - Prob. 68RECh. 2 - Prob. 69RECh. 2 - Prob. 70RECh. 2 - Prob. 71RECh. 2 - Prob. 72RECh. 2 - Prob. 73RECh. 2 - Prob. 74RECh. 2 - Prob. 75RECh. 2 - Prob. 76RECh. 2 - Prob. 77RECh. 2 - Prob. 78RECh. 2 - Prob. 79RECh. 2 - Prob. 80RECh. 2 - Prob. 81RECh. 2 - Prob. 82RECh. 2 - Prob. 83RECh. 2 - Prob. 84RECh. 2 - Prob. 85RECh. 2 - Prob. 86RECh. 2 - Prob. 87RECh. 2 - Prob. 88RECh. 2 - Prob. 89RECh. 2 - Prob. 90RECh. 2 - Prob. 91RECh. 2 - Prob. 92RECh. 2 - Prob. 1DECh. 2 - Prob. 2DECh. 2 - (a) Find an expression of the form p+qi for the...Ch. 2 - Prob. 4DECh. 2 - Prob. 5DECh. 2 - Prob. 6DECh. 2 - Prob. 7DECh. 2 - Prob. 8DECh. 2 - Prob. 9DE
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