11th Edition

ISBN: 9780136845881

Author: Sullivan

Publisher: VST

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Textbook Question

Chapter 2.1, Problem 18AYU

In Problems 17 and 18 , a relation expressed verbally is given.

What is the domain and the range of relation ?

Express the relation using mapping.

Express the relation as a set of ordered pairs.

A researcher wants to investigate how weight depends on height among adult males in Europe. She visits five regions in Europe and determines the average heights in those regions to be 1.80 , 1.78 , 1.77 , 1.77 , and 1.80 meters. The corresponding average weights are 87.1 , 86.9 , 83.0 , 84.1 , and 86.4 kg, respectively.

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Chapter 2.1, Problem 17AYU

Chapter 2.1, Problem 19AYU

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1. Abel's Theorem. The goal in this problem is to prove Abel's theorem by following a series of steps (each step must be justified). Theorem 0.1 (Abel's Theorem). If y1 and y2 are solutions of the differential equation y" + p(t) y′ + q(t) y = 0, where p and q are continuous on an open interval, then the Wronskian is given by W (¥1, v2)(t) = c exp(− [p(t) dt), where C is a constant that does not depend on t. Moreover, either W (y1, y2)(t) = 0 for every t in I or W (y1, y2)(t) = 0 for every t in I. 1. (a) From the two equations (which follow from the hypotheses), show that y" + p(t) y₁ + q(t) y₁ = 0 and y½ + p(t) y2 + q(t) y2 = 0, 2. (b) Observe that Hence, conclude that (YY2 - Y1 y2) + P(t) (y₁ Y2 - Y1 Y2) = 0. W'(y1, y2)(t) = yY2 - Y1 y2- W' + p(t) W = 0. 3. (c) Use the result from the previous step to complete the proof of the theorem.

2. Observations on the Wronskian. Suppose the functions y₁ and y2 are solutions to the differential equation p(x)y" + q(x)y' + r(x) y = 0 on an open interval I. 1. (a) Prove that if y₁ and y2 both vanish at the same point in I, then y₁ and y2 cannot form a fundamental set of solutions. 2. (b) Prove that if y₁ and y2 both attain a maximum or minimum at the same point in I, then y₁ and Y2 cannot form a fundamental set of solutions. 3. (c) show that the functions & and t² are linearly independent on the interval (−1, 1). Verify that both are solutions to the differential equation t² y″ – 2ty' + 2y = 0. Then justify why this does not contradict Abel's theorem. 4. (d) What can you conclude about the possibility that t and t² are solutions to the differential equation y" + q(x) y′ + r(x)y = 0?

Question 4 Find an equation of (a) The plane through the point (2, 0, 1) and perpendicular to the line x = y=2-t, z=3+4t. 3t, (b) The plane through the point (3, −2, 8) and parallel to the plane z = x+y. (c) The plane that contains the line x = 1+t, y = 2 − t, z = 4 - 3t and is parallel to the plane 5x + 2y + z = 1. (d) The plane that passes through the point (1,2,3) and contains the line x = 3t, y = 1+t, and z = 2-t. (e) The plane that contains the lines L₁: x = 1 + t, y = 1 − t, z = 2t and L2 : x = 2 − s, y = s, z = 2.

Chapter 2 Solutions

EBK PEARSON ETEXT PRECALCULUS -- ACCESS

Ch. 2.1 - The inequality 1x3 can be written in interval...Ch. 2.1 - If x=2 , the value of the expression 3 x 2 5x+ 1 x...Ch. 2.1 - The domain of the variable in the expression x3...Ch. 2.1 - Solve the inequality: 32x5 . Graph the solution...Ch. 2.1 - To rationalize the denominator of 3 5 2 , multiply...Ch. 2.1 - A quotient is considered rationalized if its...Ch. 2.1 - If f is a function defined by the equation y=f( x...Ch. 2.1 - The set of all images of the elements in the...Ch. 2.1 - The independent variable is sometimes referred to...Ch. 2.1 - If f( x )=x+1 and g( x )= x 3 , then _______ = x 3...

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Solution Summary: The author explains that the relation is defined as height as input and weight as output.

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