CALCULUS AND ITS APPLICATIONS BRIEF
12th Edition
ISBN: 9780135998229
Author: BITTINGER
Publisher: PEARSON
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Chapter 5, Problem 42T
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A ladder 25 feet long is leaning against the wall of a building. Initially, the foot of the ladder is 7 feet from the wall. The foot of the ladder begins to slide at a rate of 2 ft/sec, causing the top of the ladder to slide down the wall. The location of the foot of the ladder, its x coordinate, at time t seconds is given by
x(t)=7+2t.
wall
y(1)
25 ft. ladder
x(1)
ground
(a) Find the formula for the location of the top of the ladder, the y coordinate, as a function of time t. The formula for y(t)= √ 25² - (7+2t)²
(b) The domain of t values for y(t) ranges from 0
(c) Calculate the average velocity of the top of the ladder on each of these time intervals (correct to three decimal places):
. (Put your cursor in the box, click and a palette will come up to help you enter your symbolic answer.)
time interval
ave velocity
[0,2]
-0.766
[6,8]
-3.225
time interval
ave velocity
-1.224
-9.798
[2,4]
[8,9]
(d) Find a time interval [a,9] so that the average velocity of the top of the ladder on this…
Total marks 15
3.
(i)
Let FRN Rm be a mapping and x = RN is a given
point. Which of the following statements are true? Construct counterex-
amples for any that are false.
(a)
If F is continuous at x then F is differentiable at x.
(b)
If F is differentiable at x then F is continuous at x.
If F is differentiable at x then F has all 1st order partial
(c)
derivatives at x.
(d) If all 1st order partial derivatives of F exist and are con-
tinuous on RN then F is differentiable at x.
[5 Marks]
(ii) Let mappings
F= (F1, F2) R³ → R² and
G=(G1, G2) R² → R²
:
be defined by
F₁ (x1, x2, x3) = x1 + x²,
G1(1, 2) = 31,
F2(x1, x2, x3) = x² + x3,
G2(1, 2)=sin(1+ y2).
By using the chain rule, calculate the Jacobian matrix of the mapping
GoF R3 R²,
i.e., JGoF(x1, x2, x3). What is JGOF(0, 0, 0)?
(iii)
[7 Marks]
Give reasons why the mapping Go F is differentiable at
(0, 0, 0) R³ and determine the derivative matrix D(GF)(0, 0, 0).
[3 Marks]
5.
(i)
Let f R2 R be defined by
f(x1, x2) = x² - 4x1x2 + 2x3.
Find all local minima of f on R².
(ii)
[10 Marks]
Give an example of a function f: R2 R which is not bounded
above and has exactly one critical point, which is a minimum. Justify briefly
Total marks 15
your answer.
[5 Marks]
Chapter 5 Solutions
CALCULUS AND ITS APPLICATIONS BRIEF
Ch. 5.1 - In Exercises 1-14, is the price, in dollars per...Ch. 5.1 - In Exercises 1-14, is the price, in dollars per...Ch. 5.1 - In Exercises 1-14, D(x) is the price, in dollars...Ch. 5.1 - In Exercises 1-14, is the price, in dollars per...Ch. 5.1 - In Exercises 1-14, D(x) is the price, in dollars...Ch. 5.1 - In Exercises 1-14, D(x) is the price, in dollars...Ch. 5.1 - In Exercises 1-14, D(x) is the price, in dollars...Ch. 5.1 - Prob. 8ECh. 5.1 - Prob. 9ECh. 5.1 - Prob. 10E
Ch. 5.1 - In Exercises 1-14, D(x) is the price, in dollars...Ch. 5.1 - In Exercises 1-14, is the price, in dollars per...Ch. 5.1 - In Exercises 1-14, D(x) is the price, in dollars...Ch. 5.1 - In Exercises 1-14, D(x) is the price, in dollars...Ch. 5.1 - Business: Consumer and Producer Surplus. Beth...Ch. 5.1 - 16. Business: Consumer and Producer Surplus. Chris...Ch. 5.1 - Prob. 17ECh. 5.1 - Prob. 18ECh. 5.1 - Prob. 19ECh. 5.1 - In Exercises 17–22, a price ceiling or price...Ch. 5.1 - In Exercises 17–22, a price ceiling or price...Ch. 5.1 - In Exercises 17–22, a price ceiling or price...Ch. 5.1 - Rent control. Demand for apartments in Curtisville...Ch. 5.1 - Prob. 24ECh. 5.1 - Prob. 25ECh. 5.1 - Prob. 26ECh. 5.1 - For Exercises 17 and 18, follow the directions...Ch. 5.1 - For Exercises 17 and 18, follow the directions...Ch. 5.1 - Explain why both consumers and producers feel good...Ch. 5.1 - Prob. 30ECh. 5.1 - Prob. 31ECh. 5.1 - For Exercises 21 and 22, graph each pair of demand...Ch. 5.1 - For Exercises 21 and 22, graph each pair of demand...Ch. 5.1 - Bungee jumping. Regina loves bungee jumping. The...Ch. 5.2 - Find the future value P of each amount P0 invested...Ch. 5.2 - Prob. 2ECh. 5.2 - Prob. 3ECh. 5.2 - Prob. 4ECh. 5.2 - Prob. 5ECh. 5.2 - Prob. 6ECh. 5.2 - Prob. 7ECh. 5.2 - Prob. 8ECh. 5.2 - Prob. 9ECh. 5.2 - 22. Present value of a trust. In 16 yr, Claire...Ch. 5.2 - Present value of a trust. In 18 yr, Maggie Oaks is...Ch. 5.2 - 24. Salary Value. At age 25, Del earns his CPA and...Ch. 5.2 - 23. Salary Value. At age 35, Rochelle earns her...Ch. 5.2 - 26. Future value of an inheritance. Upon the death...Ch. 5.2 - 25. Future value of an inheritance. Upon the death...Ch. 5.2 - 28. Decision-Making. A group of entrepreneurs is...Ch. 5.2 - Prob. 28ECh. 5.2 - 30. Capital Outlay. Chrome solutions determines...Ch. 5.2 - Prob. 30ECh. 5.2 - Prob. 31ECh. 5.2 - Prob. 32ECh. 5.2 - Prob. 33ECh. 5.2 - Prob. 34ECh. 5.2 - Prob. 35ECh. 5.2 - Prob. 36ECh. 5.2 - Prob. 37ECh. 5.2 - Prob. 38ECh. 5.2 - Prob. 39ECh. 5.2 - Accumulated present value. Tania wants to have...Ch. 5.2 - Prob. 41ECh. 5.2 - Prob. 42ECh. 5.2 - Prob. 43ECh. 5.2 - Prob. 44ECh. 5.2 - Prob. 45ECh. 5.2 - The model
can be applied to calculate the...Ch. 5.2 - The model
can be applied to calculate the...Ch. 5.2 - Prob. 48ECh. 5.2 - The capitalized cost, c, of an asset over its...Ch. 5.2 - Prob. 50ECh. 5.2 - Prob. 51ECh. 5.2 - The capitalized cost, c, of an asset over its...Ch. 5.3 - Prob. 1ECh. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Prob. 3ECh. 5.3 - Prob. 4ECh. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Prob. 9ECh. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Prob. 11ECh. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Prob. 13ECh. 5.3 - Prob. 14ECh. 5.3 - Prob. 15ECh. 5.3 - Prob. 16ECh. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Prob. 20ECh. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Prob. 23ECh. 5.3 - Prob. 24ECh. 5.3 - Prob. 25ECh. 5.3 - Prob. 26ECh. 5.3 - Prob. 27ECh. 5.3 - Determine whether each improper integral is...Ch. 5.3 - 25. Find the area, if it is finite, of the region...Ch. 5.3 - 26. Find the area, if it is finite, of the region...Ch. 5.3 - 27. Find the area, if it is finite, of the region...Ch. 5.3 - Find the area, if it is finite, of the region...Ch. 5.3 - 29. Total Profit from Marginal Profit. Myna’s...Ch. 5.3 - 30. Total Profit from Marginal Profit. Find the...Ch. 5.3 - Total Production. A firm determines that it can...Ch. 5.3 - Prob. 36ECh. 5.3 - Prob. 37ECh. 5.3 - Prob. 38ECh. 5.3 - Accumulated present value. Find the accumulated...Ch. 5.3 - Accumulated present value. Find the accumulated...Ch. 5.3 - Capitalized cost. The capitalized cost, c, of an...Ch. 5.3 - Prob. 42ECh. 5.3 - Radioactive Buildup. Plutonium has a decay rate of...Ch. 5.3 - Radioactive Buildup. Cesium-137 has a decay rate...Ch. 5.3 - In the treatment of prostate cancer, radioactive...Ch. 5.3 - In the treatment of prostate cancer, radioactive...Ch. 5.3 - Prob. 47ECh. 5.3 - Prob. 48ECh. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Determine whether each improper integral is...Ch. 5.3 - Suppose an oral dose of a drug is taken. Over,...Ch. 5.3 - Suppose an oral dose of a drug is taken. Over,...Ch. 5.3 - Prob. 55ECh. 5.3 - Prob. 56ECh. 5.3 - Prob. 57ECh. 5.3 - Prob. 58ECh. 5.3 - Prob. 59ECh. 5.3 - Suppose you own a building that yields a...Ch. 5.3 - Prob. 61ECh. 5.3 - Explain why 0dxx2+1 is divergent.Ch. 5.3 - Suppose that 1fxdx is convergent, where fx0over1,....Ch. 5.3 - Suppose that 1fxdx is convergent, where fx0over1,....Ch. 5.3 - Approximate each integral. 141+x2dxCh. 5.3 - Prob. 66ECh. 5.3 - Prob. 67ECh. 5.3 - Prob. 68ECh. 5.4 - Prob. 1ECh. 5.4 - Prob. 2ECh. 5.4 - Prob. 3ECh. 5.4 - Prob. 4ECh. 5.4 - Prob. 5ECh. 5.4 - Prob. 6ECh. 5.4 - Prob. 7ECh. 5.4 - Prob. 8ECh. 5.4 - Prob. 9ECh. 5.4 - Prob. 10ECh. 5.4 - Prob. 11ECh. 5.4 - Prob. 12ECh. 5.4 - Prob. 13ECh. 5.4 - Prob. 14ECh. 5.4 - Prob. 15ECh. 5.4 - Prob. 16ECh. 5.4 - Find k such that each function is a probability...Ch. 5.4 - Find k such that each function is a probability...Ch. 5.4 - Find k such that each function is a probability...Ch. 5.4 - Find k such that each function is a probability...Ch. 5.4 - Find k such that each function is a probability...Ch. 5.4 - Prob. 22ECh. 5.4 - A dart is thrown at a number line in such a way...Ch. 5.4 - Prob. 24ECh. 5.4 - Prob. 25ECh. 5.4 - Prob. 26ECh. 5.4 - Prob. 27ECh. 5.4 - Transportation planning. Refer to Example 7....Ch. 5.4 - Duration of a phone call. A cell phone provider...Ch. 5.4 - Prob. 30ECh. 5.4 - Prob. 31ECh. 5.4 - Prob. 32ECh. 5.4 - 35. Wait time for 911 calls. The wait time before...Ch. 5.4 - Prob. 34ECh. 5.4 - Prob. 35ECh. 5.4 - Prob. 36ECh. 5.4 - Prob. 37ECh. 5.4 - Prob. 38ECh. 5.4 - Explain why the probability that a rat will learn...Ch. 5.4 - Prob. 40ECh. 5.4 - Prob. 41ECh. 5.4 - Prob. 42ECh. 5.4 - Prob. 43ECh. 5.4 - Prob. 44ECh. 5.4 - Prob. 45ECh. 5.4 - Prob. 46ECh. 5.4 - Prob. 47ECh. 5.4 - Prob. 48ECh. 5.4 - Prob. 49ECh. 5.4 - Use a calculator or algebra software to verify...Ch. 5.4 - Use a calculator or algebra software to verify...Ch. 5.4 - Use a calculator or algebra software to verify...Ch. 5.4 - Prob. 53ECh. 5.4 - Prob. 54ECh. 5.4 - Prob. 55ECh. 5.4 - Prob. 56ECh. 5.4 - Prob. 57ECh. 5.4 - Prob. 58ECh. 5.5 - For each probability density function, over the...Ch. 5.5 - For each probability density function, over the...Ch. 5.5 - For each probability density function, over the...Ch. 5.5 - For each probability density function, over the...Ch. 5.5 - For each probability density function, over the...Ch. 5.5 - Prob. 6ECh. 5.5 - Prob. 7ECh. 5.5 - Prob. 8ECh. 5.5 - For each probability density function, over the...Ch. 5.5 - For each probability density function, over the...Ch. 5.5 - Prob. 11ECh. 5.5 - Prob. 12ECh. 5.5 - Prob. 13ECh. 5.5 - Let x be a continuous random variable with a...Ch. 5.5 - Prob. 15ECh. 5.5 - Prob. 16ECh. 5.5 - Prob. 17ECh. 5.5 - Let x be a continuous random variable with a...Ch. 5.5 - Let x be a continuous random variable with a...Ch. 5.5 - Prob. 20ECh. 5.5 - Prob. 21ECh. 5.5 - Prob. 22ECh. 5.5 - Prob. 23ECh. 5.5 - Prob. 24ECh. 5.5 - Prob. 25ECh. 5.5 - Let x be a continuous random variable that is...Ch. 5.5 - Let x be a continuous random variable that is...Ch. 5.5 - Prob. 28ECh. 5.5 - Prob. 29ECh. 5.5 - Prob. 30ECh. 5.5 - Prob. 31ECh. 5.5 - Prob. 32ECh. 5.5 - Prob. 33ECh. 5.5 - Prob. 34ECh. 5.5 - Prob. 35ECh. 5.5 - Prob. 36ECh. 5.5 - Let x be a continuous random variable that is...Ch. 5.5 - Let x be a continuous random variable that is...Ch. 5.5 - 55. Find the z-value that corresponds to each...Ch. 5.5 - 56. In a normal distribution with and, find the...Ch. 5.5 - 57. In a normal distribution with and, find the...Ch. 5.5 - 58. In a normal distribution with and, find the...Ch. 5.5 - Prob. 43ECh. 5.5 - Bread Baking. The number of loaves of bread, N...Ch. 5.5 - Prob. 45ECh. 5.5 - In an automotive body-welding line, delays...Ch. 5.5 - Prob. 47ECh. 5.5 - 64. Test Score Distribution. The scores on a...Ch. 5.5 - Test Score Distribution. In a large class, student...Ch. 5.5 - 66. Average Temperature. Las Vegas, Nevada, has an...Ch. 5.5 - 67. Heights of Basketball Players. Players in the...Ch. 5.5 - 68. Bowling Scores. At the time this book was...Ch. 5.5 - Prob. 53ECh. 5.5 - For each probability density function, over the...Ch. 5.5 - Prob. 55ECh. 5.5 - Prob. 56ECh. 5.5 - Prob. 57ECh. 5.5 - 74. Business: Coffee Production. Suppose the...Ch. 5.5 - 75. Business: Does thy cup overflow? Suppose the...Ch. 5.5 - Prob. 60ECh. 5.5 - Prob. 61ECh. 5.5 - Prob. 62ECh. 5.5 - Prob. 63ECh. 5.5 - Prob. 64ECh. 5.5 - 76. Explain why a normal distribution may not...Ch. 5.5 - A professor gives an easy test worth 100 points....Ch. 5.5 - Prob. 67ECh. 5.5 - Prob. 68ECh. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Prob. 2ECh. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Prob. 10ECh. 5.6 - Prob. 11ECh. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Prob. 13ECh. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Find the volume generated by rotating the area...Ch. 5.6 - Let R be the area bounded by the graph of y=9x and...Ch. 5.6 -
31. Let R be the area bounded by the graph of ...Ch. 5.6 - Prob. 33ECh. 5.6 - Prob. 34ECh. 5.6 - Volume of a Hogan. A Hogan is a circular shelter...Ch. 5.6 - Volume of a domed stadium. The volume of a stadium...Ch. 5.6 - Prob. 37ECh. 5.6 - Calculating volume using disks, prove that the...Ch. 5.6 - Find the volume generated by rotating about the...Ch. 5.6 - Find the volume generated by rotating about the...Ch. 5.6 - In Exercises 41 and 42, the first quadrant is the...Ch. 5.6 - In Exercises 41 and 42, the first quadrant is the...Ch. 5.6 - Let R be the area between y=x+1 and the x-axis...Ch. 5.6 - 44. Let R be the area between the x-axis, and the...Ch. 5.6 - Prob. 45ECh. 5.6 - Paradox of Gabriels horn or the infinite paint...Ch. 5.6 - Prob. 47ECh. 5.6 - Let R be the area between the graph of y=x+x2x3...Ch. 5.6 - Prob. 49ECh. 5.7 - Prob. 7ECh. 5.7 - Prob. 8ECh. 5.7 - Let yy30y=0 a) Show that y=e6x is a solution of...Ch. 5.7 - In Exercises 15-22, (a) find the general solution...Ch. 5.7 - Prob. 16ECh. 5.7 - In Exercises 15-22, (a) find the general solution...Ch. 5.7 - Prob. 18ECh. 5.7 - In Exercises 15-22, (a) find the general solution...Ch. 5.7 - Prob. 20ECh. 5.7 - In Exercises 21–30, (a) find the particular...Ch. 5.7 - In Exercises 21–30, (a) find the particular...Ch. 5.7 - In Exercises 23-34, (a) find the particular...Ch. 5.7 - Prob. 24ECh. 5.7 - In Exercises 23-34, (a) find the particular...Ch. 5.7 - Prob. 26ECh. 5.7 - Prob. 27ECh. 5.7 - Prob. 28ECh. 5.7 - In Exercises 23-34, (a) find the particular...Ch. 5.7 - In Exercises 23-34, (a) find the particular...Ch. 5.7 - Solve by separating variables.
36.
Ch. 5.7 - Solve by separating variables.
35.
Ch. 5.7 - Solve by separating variables.
38.
Ch. 5.7 - Solve by separating variables.
37.
Ch. 5.7 - Prob. 35ECh. 5.7 - Prob. 36ECh. 5.7 - Prob. 37ECh. 5.7 - Solve by separating variables. dydx=6yCh. 5.7 - Prob. 41ECh. 5.7 - Prob. 42ECh. 5.7 - 53. Growth of an Account. Debra deposits into an...Ch. 5.7 - Growth of an Account. Jennifer deposits A0=1200...Ch. 5.7 - Prob. 45ECh. 5.7 - Prob. 46ECh. 5.7 - Capital Expansion. Domars capital expansion model...Ch. 5.7 - Prob. 49ECh. 5.7 - Prob. 50ECh. 5.7 - Prob. 51ECh. 5.7 - Prob. 52ECh. 5.7 - Population Growth. An initial population of 70...Ch. 5.7 - Population Growth. Before 1859, rabbits did not...Ch. 5.7 - Population Growth. Suppose 30 sparrows are...Ch. 5.7 - The Brentano-Stevens Law. The validity of the...Ch. 5.7 - Prob. 58ECh. 5.7 - 69. The amount of money, in Ina’s saving account...Ch. 5.7 - 70. The amount of money, in John’s savings...Ch. 5.7 - Solve.
71.
Ch. 5.7 - Solve.
72.
Ch. 5.7 - Explain the difference between a constant rate of...Ch. 5.7 - 74. What function is also its own derivative?...Ch. 5.7 - Prob. 65ECh. 5.7 - 76. Solve . Graph the particular solutions for ,...Ch. 5.7 - Prob. 67ECh. 5 - These review exercises are for test preparation....Ch. 5 - These review exercises are for test preparation....Ch. 5 - These review exercises are for test preparation....Ch. 5 - These review exercises are for test preparation....Ch. 5 - These review exercises are for test preparation....Ch. 5 - These review exercises are for test preparation....Ch. 5 - Exponential distribution [5.4]Ch. 5 - Classify each statement as either true or false....Ch. 5 - Prob. 9RECh. 5 - Classify each statement as either true or false....Ch. 5 - Prob. 11RECh. 5 - Prob. 12RECh. 5 - Classify each statement as either true or false....Ch. 5 - If y=e0.05t is a solution of y=0.05y, then...Ch. 5 - Let be the price, in dollars per unit, that...Ch. 5 - Let D(x)=(x6)2 be the price, in dollars per unit,...Ch. 5 - Prob. 17RECh. 5 - Prob. 18RECh. 5 - Prob. 19RECh. 5 - Prob. 20RECh. 5 - Prob. 21RECh. 5 - Prob. 22RECh. 5 - Prob. 23RECh. 5 - Prob. 24RECh. 5 - Physical science: depletion of iron ore. World...Ch. 5 - Determine whether each improper integral is...Ch. 5 - Determine whether each improper integral is...Ch. 5 - Determine whether each improper integral is...Ch. 5 - Prob. 29RECh. 5 - Business: waiting time. Sharif arrives at a random...Ch. 5 - Prob. 31RECh. 5 - Prob. 32RECh. 5 - Prob. 33RECh. 5 - Prob. 34RECh. 5 - Given the probability density function...Ch. 5 - Let x be a continuous random variable with a...Ch. 5 - Let x be a continuous random variable with a...Ch. 5 - Prob. 38RECh. 5 - Prob. 39RECh. 5 - Prob. 40RECh. 5 - Prob. 41RECh. 5 - Prob. 42RECh. 5 - Prob. 43RECh. 5 - Prob. 44RECh. 5 - Prob. 45RECh. 5 - Find the volume generated by rotating the area...Ch. 5 - Solve each differential equation.
43.
Ch. 5 - Prob. 48RECh. 5 - Prob. 49RECh. 5 - Prob. 50RECh. 5 - Prob. 51RECh. 5 - Prob. 52RECh. 5 - Prob. 53RECh. 5 - Prob. 54RECh. 5 - Prob. 55RECh. 5 - Prob. 56RECh. 5 - Prob. 57RECh. 5 - Prob. 58RECh. 5 - Prob. 59RECh. 5 - Prob. 60RECh. 5 - Prob. 1TCh. 5 - Prob. 2TCh. 5 - Prob. 3TCh. 5 - Prob. 4TCh. 5 - Prob. 5TCh. 5 - Prob. 6TCh. 5 - Prob. 7TCh. 5 - Prob. 8TCh. 5 - Prob. 9TCh. 5 - Prob. 10TCh. 5 - Business: future value of a noncontinuous income...Ch. 5 - Determine whether each improper integral is...Ch. 5 - Determine whether each improper integral is...Ch. 5 - Prob. 14TCh. 5 - Business: times of telephone calls. A telephone...Ch. 5 - Prob. 16TCh. 5 - Given the probability density function over find...Ch. 5 - Given the probability density function over find...Ch. 5 - Given the probability density function f(x)=14x...Ch. 5 - Given the probability density function over find...Ch. 5 - Prob. 21TCh. 5 - Prob. 22TCh. 5 - Prob. 23TCh. 5 - Business: price distribution. The price per pound...Ch. 5 - Prob. 25TCh. 5 - Find the volume generated by rotating the area...Ch. 5 - Prob. 27TCh. 5 - Prob. 28TCh. 5 - Prob. 29TCh. 5 - Business: grain storage. A grain silo is a...Ch. 5 - Prob. 31TCh. 5 - Prob. 32TCh. 5 - Solve each differential equation. dydt=6y;y=11...Ch. 5 - Prob. 34TCh. 5 - Prob. 35TCh. 5 - Solve each differential equation. y=4y+xyCh. 5 - Economics: elasticity. Find the demand function...Ch. 5 - Prob. 38TCh. 5 - Prob. 39TCh. 5 - Prob. 40TCh. 5 - Prob. 41TCh. 5 - Prob. 42TCh. 5 - Prob. 1ETECh. 5 - Prob. 2ETECh. 5 - Now consider the bottle shown at the right. To...Ch. 5 - Prob. 4ETE
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- Total marks 15 4. : Let f R2 R be defined by f(x1, x2) = 2x²- 8x1x2+4x+2. Find all local minima of f on R². [10 Marks] (ii) Give an example of a function f R2 R which is neither bounded below nor bounded above, and has no critical point. Justify briefly your answer. [5 Marks]arrow_forward4. Let F RNR be a mapping. (i) x ЄRN ? (ii) : What does it mean to say that F is differentiable at a point [1 Mark] In Theorem 5.4 in the Lecture Notes we proved that if F is differentiable at a point x E RN then F is continuous at x. Proof. Let (n) CRN be a sequence such that xn → x ЄERN as n → ∞. We want to show that F(xn) F(x), which means F is continuous at x. Denote hnxn - x, so that ||hn|| 0. Thus we find ||F(xn) − F(x)|| = ||F(x + hn) − F(x)|| * ||DF (x)hn + R(hn) || (**) ||DF(x)hn||+||R(hn)||| → 0, because the linear mapping DF(x) is continuous and for all large nЄ N, (***) ||R(hn) || ||R(hn) || ≤ → 0. ||hn|| (a) Explain in details why ||hn|| → 0. [3 Marks] (b) Explain the steps labelled (*), (**), (***). [6 Marks]arrow_forward4. In Theorem 5.4 in the Lecture Notes we proved that if F: RN → Rm is differentiable at x = RN then F is continuous at x. Proof. Let (xn) CRN be a sequence such that x → x Є RN as n → ∞. We want F(x), which means F is continuous at x. to show that F(xn) Denote hn xnx, so that ||hn||| 0. Thus we find ||F (xn) − F(x) || (*) ||F(x + hn) − F(x)|| = ||DF(x)hn + R(hn)|| (**) ||DF(x)hn|| + ||R(hn) || → 0, because the linear mapping DF(x) is continuous and for all large n = N, |||R(hn) || ≤ (***) ||R(hn)|| ||hn|| → 0. Explain the steps labelled (*), (**), (***) [6 Marks] (ii) Give an example of a function F: RR such that F is contin- Total marks 10 uous at x=0 but F is not differentiable at at x = 0. [4 Marks]arrow_forward
- 3. Let f R2 R be a function. (i) Explain in your own words the relationship between the existence of all partial derivatives of f and differentiability of f at a point x = R². (ii) Consider R2 → R defined by : [5 Marks] f(x1, x2) = |2x1x2|1/2 Show that af af -(0,0) = 0 and -(0, 0) = 0, Jx1 მx2 but f is not differentiable at (0,0). [10 Marks]arrow_forward(1) Write the following quadratic equation in terms of the vertex coordinates.arrow_forwardThe final answer is 8/π(sinx) + 8/3π(sin 3x)+ 8/5π(sin5x)....arrow_forward
- Keity x२ 1. (i) Identify which of the following subsets of R2 are open and which are not. (a) A = (2,4) x (1, 2), (b) B = (2,4) x {1,2}, (c) C = (2,4) x R. Provide a sketch and a brief explanation to each of your answers. [6 Marks] (ii) Give an example of a bounded set in R2 which is not open. [2 Marks] (iii) Give an example of an open set in R2 which is not bounded. [2 Marksarrow_forward2. (i) Which of the following statements are true? Construct coun- terexamples for those that are false. (a) sequence. Every bounded sequence (x(n)) nEN C RN has a convergent sub- (b) (c) (d) Every sequence (x(n)) nEN C RN has a convergent subsequence. Every convergent sequence (x(n)) nEN C RN is bounded. Every bounded sequence (x(n)) EN CRN converges. nЄN (e) If a sequence (xn)nEN C RN has a convergent subsequence, then (xn)nEN is convergent. [10 Marks] (ii) Give an example of a sequence (x(n))nEN CR2 which is located on the parabola x2 = x², contains infinitely many different points and converges to the limit x = (2,4). [5 Marks]arrow_forward2. (i) What does it mean to say that a sequence (x(n)) nEN CR2 converges to the limit x E R²? [1 Mark] (ii) Prove that if a set ECR2 is closed then every convergent sequence (x(n))nen in E has its limit in E, that is (x(n)) CE and x() x x = E. [5 Marks] (iii) which is located on the parabola x2 = = x x4, contains a subsequence that Give an example of an unbounded sequence (r(n)) nEN CR2 (2, 16) and such that x(i) converges to the limit x = (2, 16) and such that x(i) # x() for any i j. [4 Marksarrow_forward
- 1. (i) which are not. Identify which of the following subsets of R2 are open and (a) A = (1, 3) x (1,2) (b) B = (1,3) x {1,2} (c) C = AUB (ii) Provide a sketch and a brief explanation to each of your answers. [6 Marks] Give an example of a bounded set in R2 which is not open. (iii) [2 Marks] Give an example of an open set in R2 which is not bounded. [2 Marks]arrow_forward2. if limit. Recall that a sequence (x(n)) CR2 converges to the limit x = R² lim ||x(n)x|| = 0. 818 - (i) Prove that a convergent sequence (x(n)) has at most one [4 Marks] (ii) Give an example of a bounded sequence (x(n)) CR2 that has no limit and has accumulation points (1, 0) and (0, 1) [3 Marks] (iii) Give an example of a sequence (x(n))neN CR2 which is located on the hyperbola x2 1/x1, contains infinitely many different Total marks 10 points and converges to the limit x = (2, 1/2). [3 Marks]arrow_forward3. (i) Consider a mapping F: RN Rm. Explain in your own words the relationship between the existence of all partial derivatives of F and dif- ferentiability of F at a point x = RN. (ii) [3 Marks] Calculate the gradient of the following function f: R2 → R, f(x) = ||x||3, Total marks 10 where ||x|| = √√√x² + x/2. [7 Marks]arrow_forward
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