MML PRECALCULUS ENHANCED
7th Edition
ISBN: 9780134119250
Author: Sullivan
Publisher: INTER PEAR
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Textbook Question
Chapter 13.2, Problem 39AE
Stocks on the NYSE Companies whose stocks are listed on the New York Stock Exchange (NYSE) have their company name represented by 1, 2, or 3 letters (repetition of letters is allowed). What is the maximum number of companies that can be listed on the NYSE?
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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 13 Solutions
MML PRECALCULUS ENHANCED
Ch. 13.1 - Prob. 1AYPCh. 13.1 - Prob. 2AYPCh. 13.1 - True or false The intersection of two sets is...Ch. 13.1 - Prob. 4AYPCh. 13.1 - Prob. 5CVCh. 13.1 - If the number of elements in a set is a...Ch. 13.1 - Prob. 7CVCh. 13.1 - True or False If a task consists of a sequence of...Ch. 13.1 - Prob. 9SBCh. 13.1 - Prob. 10SB
Ch. 13.1 - If n( A )=15 , n( B )=20 , and n( AB )=10 , find...Ch. 13.1 - If n( A )=30 , n( B )=40 , and n( AB )=45 , find...Ch. 13.1 - If n( AB )=50 , n( AB )=10 , and n( B )=20 , find...Ch. 13.1 - If n( AB )=60 , n( AB )=40 , and n( A )=n( B ) ,...Ch. 13.1 - In Problems 15-22, use ihe information given in...Ch. 13.1 - In Problems 15-22, use ihe information given in...Ch. 13.1 - In Problems 15-22, use ihe information given in...Ch. 13.1 - In Problems 15-22, use ihe information given in...Ch. 13.1 - In Problems 15-22, use ihe information given in...Ch. 13.1 - In Problems 15-22, use ihe information given in...Ch. 13.1 - In Problems 15-22, use ihe information given in...Ch. 13.1 - In Problems 15-22, use ihe information given in...Ch. 13.1 - Shirts and Ties A man has 5 shirts and 3 ties. How...Ch. 13.1 - Blouses and Skirts A woman has 5 blouses and 8...Ch. 13.1 - Four-digit Numbers How many four-digit numbers can...Ch. 13.1 - Five-digit Numbers How many five-digit numbers can...Ch. 13.1 - Analyzing Survey Data In a consumer survey of 500...Ch. 13.1 - Analyzing Survey Data In a student survey, 200...Ch. 13.1 - Analyzing Survey Data In a survey of 100 investors...Ch. 13.1 - Prob. 30AECh. 13.1 - Demographics The following data represent the...Ch. 13.1 - Prob. 32AECh. 13.1 - Stock Portfolios As a financial planner, you are...Ch. 13.1 - Make up a problem different from any found in the...Ch. 13.1 - Problems 36-39 are based on material learned...Ch. 13.1 - Problems 36-39 are based on material learned...Ch. 13.1 - Problems 36-39 are based on material learned...Ch. 13.1 - Problems 36-39 are based on material learned...Ch. 13.2 - 0!= ; 1!= . (p. 642)Ch. 13.2 - True or False n!= ( n+1 )! n . (p. 642)Ch. 13.2 - A(n) __________ is an ordered arrangement of r...Ch. 13.2 - A(n) ___________ is an arrangement of r objects...Ch. 13.2 - P( n,r )= __________________.Ch. 13.2 - C( n,r )= _______________________.Ch. 13.2 - In Problems 7-14, find the value of each...Ch. 13.2 - In Problems 7-14, find the value of each...Ch. 13.2 - In Problems 7-14, find the value of each...Ch. 13.2 - In Problems 7-14, find the value of each...Ch. 13.2 - In Problems 7-14, find the value of each...Ch. 13.2 - In Problems 7-14, find the value of each...Ch. 13.2 - In Problems 7-14, find the value of each...Ch. 13.2 - In Problems 7-14, find the value of each...Ch. 13.2 - In Problems 15-22, use formula (2) to find the...Ch. 13.2 - In Problems 15-22, use formula (2) to find the...Ch. 13.2 - In Problems 15-22, use formula (2) to find the...Ch. 13.2 - In Problems 15-22, use formula (2) to find the...Ch. 13.2 - In Problems 15-22, use formula (2) to find the...Ch. 13.2 - In Problems 15-22, use formula (2) to find the...Ch. 13.2 - In Problems 15-22, use formula (2) to find the...Ch. 13.2 - In Problems 15-22, use formula (2) to find the...Ch. 13.2 - List all the ordered arrangements of 5 objects a ,...Ch. 13.2 - List all the ordered arrangements of 5 objects a ,...Ch. 13.2 - List all the ordered arrangements of 4 objects 1,...Ch. 13.2 - List all the ordered arrangements of 6 objects 1,...Ch. 13.2 - List all the combinations of 5 objects a , b , c ,...Ch. 13.2 - List all the combinationss of 5 objects a , b , c...Ch. 13.2 - List all the combinations of 4 objects 1, 2, 3,...Ch. 13.2 - List all the combinationss of 6 objects 1, 2, 3,...Ch. 13.2 - Forming Codes How many two-letter codes can be...Ch. 13.2 - Forming Codes How many two-letter codes can be...Ch. 13.2 - Forming Numbers How many three-digit numbers can...Ch. 13.2 - Forming Numbers How many three-digit numbers can...Ch. 13.2 - Lining People Up In how many ways can 4 people be...Ch. 13.2 - Stacking Boxes In how many ways can 5 different...Ch. 13.2 - Forming Codes How many different three-letter...Ch. 13.2 - Forming Codes How many different four-letter codes...Ch. 13.2 - Stocks on the NYSE Companies whose stocks are...Ch. 13.2 - Stocks on the NASDAQ Companies whose stocks are...Ch. 13.2 - Establishing Committees In how many ways can a...Ch. 13.2 - Establishing Committees In how many ways can a...Ch. 13.2 - Possible Answers on a True/False Test How many...Ch. 13.2 - Possible Answers on a Multiple-choice Test How...Ch. 13.2 - Arranging Books Five different mathematics books...Ch. 13.2 - Forming License Plate Numbers How many different...Ch. 13.2 - Birthday Problem In how many ways can 2 people...Ch. 13.2 - Birthday Problem In how many ways can 5 people all...Ch. 13.2 - Forming a Committee A student dance committee is...Ch. 13.2 - Forming a Committee The student relations...Ch. 13.2 - Forming Words How many different 9-letter words...Ch. 13.2 - Forming Words How many different 11-letter words...Ch. 13.2 - Selecting Objects An urn contains 7 white balls...Ch. 13.2 - Selecting Objects An urn contains 15 red balls and...Ch. 13.2 - Senate Committees The U.S. Senate has 100 members....Ch. 13.2 - Football Teams A defensive football squad consists...Ch. 13.2 - Baseball In the American Baseball League, a...Ch. 13.2 - Baseball In the National Baseball League, the...Ch. 13.2 - Baseball Teams A baseball team has 15 members....Ch. 13.2 - World Series In the World Series the American...Ch. 13.2 - Basketball Teams A basketball team has 6 players...Ch. 13.2 - Basketball Teams On a basketball team of 12...Ch. 13.2 - Combination Locks A combination lock displays 50...Ch. 13.2 - Create a problem different from any found in the...Ch. 13.2 - Create a problem different from any found in the...Ch. 13.2 - Explain the difference between a permutation and a...Ch. 13.2 - Problems 67-70 are based on material learned...Ch. 13.2 - Problems 67-70 are based on material learned...Ch. 13.2 - Problems 67-70 are based on material learned...Ch. 13.2 - Problems 67-70 are based on material learned...Ch. 13.3 - When the same probability is assigned to each...Ch. 13.3 - The _____________of an event E is the set of all...Ch. 13.3 - True or False The probability of an event can...Ch. 13.3 - True or False In a probability model, the sum of...Ch. 13.3 - In a probability model, which of the following...Ch. 13.3 - In a probability model, which of the following...Ch. 13.3 - Determine whether the following is a probability...Ch. 13.3 - Determine whether the following is a probability...Ch. 13.3 - Determine whether the following is a probability...Ch. 13.3 - Determine whether the following is a probability...Ch. 13.3 - In Problems 11-16, construct a probability model...Ch. 13.3 - In Problems 11-16, construct a probability model...Ch. 13.3 - In Problems 11-16, construct a probability model...Ch. 13.3 - In Problems 11-16, construct a probability model...Ch. 13.3 - In Problems 11-16, construct a probability model...Ch. 13.3 - In Problems 11-16, construct a probability model...Ch. 13.3 - In Problems 17-22, use the following spinners to...Ch. 13.3 - In Problems 17-22, use the following spinners to...Ch. 13.3 - In Problems 17-22, use the following spinners to...Ch. 13.3 - In Problems 17-22, use the following spinners to...Ch. 13.3 - In Problems 17-22, use the following spinners to...Ch. 13.3 - In Problems 17-22, use the following spinners to...Ch. 13.3 - In Problems 23-26, consider the experiment of...Ch. 13.3 - In Problems 23-26, consider the experiment of...Ch. 13.3 - Prob. 25SBCh. 13.3 - Prob. 26SBCh. 13.3 - Assigning Probabilities A coin is weighted so that...Ch. 13.3 - Assigning Probabilities A coin is weighted so that...Ch. 13.3 - Assigning Probabilities A die is weighted so that...Ch. 13.3 - Assigning Probabilities A die is weighted so that...Ch. 13.3 - For Problems 31-34, the sample space is S={...Ch. 13.3 - For Problems 31-34, the sample space is S={...Ch. 13.3 - For Problems 31-34, the sample space is S={...Ch. 13.3 - For Problems 31-34, the sample space is S={...Ch. 13.3 - For Problems 35 and 36, an urn contains 5 white...Ch. 13.3 - For Problems 35 and 36, an urn contains 5 white...Ch. 13.3 - In Problems 37-40, assume equally likely outcomes....Ch. 13.3 - In Problems 37-40, assume equally likely outcomes....Ch. 13.3 - In Problems 37-40, assume equally likely outcomes....Ch. 13.3 - In Problems 37-40, assume equally likely outcomes....Ch. 13.3 - For Problems 41-44, two fair dice are rolled....Ch. 13.3 - For Problems 41-44, two fair dice are rolled....Ch. 13.3 - For Problems 41-44, two fair dice are rolled....Ch. 13.3 - In Problems 45-48, find the probability of the...Ch. 13.3 - In Problems 45-48, find the probability of the...Ch. 13.3 - In Problems 45-48, find the probability of the...Ch. 13.3 - In Problems 45-48, find the probability of the...Ch. 13.3 - If P( A )=0.60 , P( AB )=0.85 , and P( AB )=0.05 ,...Ch. 13.3 - Prob. 50SBCh. 13.3 - Prob. 51SBCh. 13.3 - Prob. 52SBCh. 13.3 - Prob. 53SBCh. 13.3 - Doctorate Degrees According to the National...Ch. 13.3 - Prob. 55SBCh. 13.3 - For Problems 57-60, a golf ball is selected at...Ch. 13.3 - Prob. 57SBCh. 13.3 - Prob. 58SBCh. 13.3 - Prob. 59SBCh. 13.3 - Prob. 60SBCh. 13.3 - On The Price Is Right, there is a game in which a...Ch. 13.3 - Prob. 62SBCh. 13.3 - Prob. 63SBCh. 13.3 - Prob. 64SBCh. 13.3 - Prob. 65SBCh. 13.3 - Prob. 66SBCh. 13.3 - Prob. 67SBCh. 13.3 - Checkout Lines Through observation, it has been...Ch. 13.3 - Prob. 69SBCh. 13.3 - Prob. 70SBCh. 13.3 - Prob. 71SBCh. 13.3 - Birthday Problem What is the probability that at...Ch. 13.3 - Prob. 73SBCh. 13.3 - Prob. 74RYKCh. 13.3 - Prob. 75RYKCh. 13.3 - Prob. 76RYKCh. 13.3 - Solve the given system using matrices. { 3x+y+2z=1...Ch. 13.R - Prob. 1RECh. 13.R - If n( A )=8 , n( B )=12 , and n( AB )=3 , find n(...Ch. 13.R - Prob. 3RECh. 13.R - Prob. 4RECh. 13.R - Prob. 5RECh. 13.R - Prob. 6RECh. 13.R - Prob. 7RECh. 13.R - Prob. 8RECh. 13.R - Prob. 9RECh. 13.R - In Problems 10 and 11, compute the value of the...Ch. 13.R - In Problems 10 and 11, compute the value of the...Ch. 13.R - Stocking a Store A clothing store sells pure wool...Ch. 13.R - Baseball On a given day, the American Baseball...Ch. 13.R - Choosing Seats If 4 people enter a bus that has 9...Ch. 13.R - Choosing a Team In how many ways can a squad of 4...Ch. 13.R - Baseball In how many ways can 2 teams from 14...Ch. 13.R - Telephone Numbers Using the digits 0, 1, 2,...,9,...Ch. 13.R - Prob. 18RECh. 13.R - Binary Codes Using the digits 0 and 1, how many...Ch. 13.R - Arranging Flags How many different vertical...Ch. 13.R - Forming Committees A group of 9 people is going to...Ch. 13.R - Birthday Problem For this problem, assume that a...Ch. 13.R - Unemployment According to the U.S. Bureau of Labor...Ch. 13.R - Prob. 24RECh. 13.R - Each of the numbers 1, 2,..., 100 is written on an...Ch. 13.R - At the Milex tune-up and brake repair shop, the...
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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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