Concept explainers
In Exercises 17-26, it is useful to think of slope as representing the average rate of change of one variable corresponding to a change in the other variable .To keep the numbers you work with small, represent the first year for which you have data as year 0. For example, in Exercise 17, the year 2009 is year 0. In Exercise 24, the year 2010 is year 0.
Female life expectancy. According to the centers for Diseases control and prevention, the life expectancy of a female born in the United States in 2009 was 80.6 years and increasing at a rate of 0.1 year. Assume that this rate of increase remains constant (source: http://www.washingtonpost.com). Model this situation by a linear equation; use this equation to estimate the life expectancy of a female born in the United States in 2030.
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Chapter 7 Solutions
Mathematics All Around-Workbook
- 8. For each of the following functions, determine whether or not it is (i) injective and/or (ii) surjective. Justify why or why not. (a) fiZZ defined by fi(n) = 2n. (b) f2 RR defined by f2(x) = x² − 4x+7. : (c) f3 Z {0, 1} defined by f3(n) = 0 if n is even and f3(n) = 1 if n is odd. (d) f4 Z N defined by f4(n) = 2n if n > 0 and f4(n) = -2n-1 if n < 0.arrow_forward2. Disprove the following by finding counterexamples: 3. (a) For all sets A and B, AU (BNA) = B. (b) For all sets A, B, and C, ANBCC if and only if ACC and B C C. Suppose A and B are subsets of a universal set U. Using the set identities¹ prove the following: (a) (ANB) U(ANB) = B (b) A (BA) = Aarrow_forwardNo chatgpt pls will upvotearrow_forward
- x+10+2 = 6 x =?arrow_forward4. Prove: If x {0, 1} then x² - -x=0. 5. 6. Prove by contrapositive: Suppose x is a real number. If x>0 then x + 16 0. Prove by contradiction: Suppose n is an integer. Then n² - n+10. Hint: You might try organizing the proof by cases on whether n is even or odd. Is n² - n+1 even or odd?arrow_forwardLet f(x)=7x²-2x and g(x) = 5x+3. Find f[g(k)].arrow_forward
- Use the method of reduction of order to find a second solution to ty"-(4t+4)+(4t+8)y = 0, t> 0 Given y₁(t) = e²t Y2(t) = Give your answer in simplest form (ie no coefficients)arrow_forward1. Suppose the domain of discourse is kinds of minerals. Let A be kinds of minerals that dissolve in acid, let S be minerals that can be scratched by an iron nail, and let C be minerals that are clear. Write expressions using set operations that represent the following sets of minerals: (a) Minerals that dissolve in acid and can be scratched by an iron nail. (b) Minerals that dissolve in acid and are not clear. (c) Minerals that are either clear or both dissolve in acid but cannot be scratched by an iron nail. (d) Minerals that are neither dissolvable in acid nor scratable by an iron nail. (e) Minerals that are either both dissolvable in acid and scratchable by an iron nail or both dissolvable in acid and not clear.arrow_forwardExpress the integrand as a sum of partial fractions and evaluate the integral. 2 32s+ 32 (s²+1) (s-1)3 ds Express the integrand as a sum of partial fractions. (Simplify your answer.)arrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillCollege AlgebraAlgebraISBN:9781305115545Author:James Stewart, Lothar Redlin, Saleem WatsonPublisher:Cengage Learning
- Algebra and Trigonometry (MindTap Course List)AlgebraISBN:9781305071742Author:James Stewart, Lothar Redlin, Saleem WatsonPublisher:Cengage LearningBig Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin HarcourtHolt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGAL
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