# MATH 107 FINAL EXAMINATION

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 College Algebra MATH 107 Spring, 2015, V1.9

MATH 107 FINAL EXAMINATION

This is an open-book exam. You may refer to your text and other course materials as you work on the exam, and you may use a calculator. You must complete the exam individually.

Neither collaboration nor consultation with others is allowed.

There are 30 problems.

Problems #1–12 are Multiple Choice.

Problems #13–21 are Short Answer. (Work not required to be shown)

Problems #22–30 are Short Answer with work required to be shown.

MULTIPLE CHOICE

 1. Determine the domain and range of the piecewise function. 1. ______

4

2

 -4 -2 2 4

-2-4

A.Domain [– 2, –0.5]; Range [–1, 0]

B.Domain [– 1, 3]; Range [– 4, 2]

C.Domain [– 4, 2]; Range [– 1, 3]

D.Domain (– , –2] [– 0.5, 2]; Range [0, 3]

 2. Solve: 21 4x = x 2. ______

A.–7

B.–7, 3

C.7

D.No solution

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College Algebra MATH 107 Spring, 2015, V1.9

3. Determine the interval(s) on which the function is increasing. 3. ______

A.(– , –3.6) and (0, 6.7)

B.(– , –2) and (4, )

C.(–1, 3)

D.(–2, 4)

 4. Determine whether the graph of y = 7 x is symmetric with respect to the origin, the x-axis, or the y-axis. 4. ______

A.symmetric with respect to the x-axis only

B.symmetric with respect to the y-axis only

C.symmetric with respect to the origin only

D.not symmetric with respect to the x-axis, not symmetric with respect to the y-axis, and not symmetric with respect to the origin

 5. Solve, and express the answer in interval notation: | 5 – 6x | 13. 5. ______

A.[–4/3, 3]

B.(– , 4/3] [3, )

C.(– , –4/3]

D.[3, )

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 College Algebra MATH 107 Spring, 2015, V1.9
 6. Which of the following represents the graph of 4x 9y = 36 ? 6. ______ A. B.
 C. D.

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College Algebra MATH 107 Spring, 2015, V1.9

7. Write a slope-intercept equation for a line parallel to the line – 2= 6 which passes through the point (–5, 2). 7. ______

A.1

22

B.2

C.9

22 D. 2

 8. Which of the following best describes the graph? 8. ______

A.It is the graph of a function and it is one-to-one.

B.It is the graph of a function and it is not one-to-one.

C.It is not the graph of a function and it is one-to-one.

D.It is not the graph of a function and it is not one-to-one.

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 College Algebra MATH 107 Spring, 2015, V1.9 9. Express as a single logarithm: log a – 2 log b + log 1 9. ______ A. a log b2 B. a +1 log 2b

+2

C.log

b

D.log (2+1)

 10. Which of the functions corresponds to the graph? 10. ______

A.(xe3

B.(xe3

C.(x2

D.(xe2

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 College Algebra MATH 107 Spring, 2015, V1.9

11. A candidate’s share of the votes varies directly as the number of votes cast for the candidate. In a city council election with four candidates, Oliver received 497 votes and earned a 35% share of the votes. Reese received 568 votes. What was Reese’s corresponding share of the votes?

11. ______

A.40%

B.42%

C.53%

D.65%

12. The graph of (x) is shown at the left and the graph of g(x) is shown at the right. (No formulas are given.) What is the relationship between g(x) and (x)?

12. ______

 4 4

2

 -4 -2 2 4 -4 -2 4 -2 - -4 -4 y = f (x) y = g(x)
 A. g(x) = f (x + 1) – 3 B. g(x) = f (x – 1) – 3 C. g(x) = f (x – 1) – 1 D. g(x) = f (x – 3) – 1

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 College Algebra MATH 107 Spring, 2015, V1.9 SHORT ANSWER: 13. Multiply and simplify: (7 + 9i)(5 + 2i). Write the answer in the form a + bi, where a and b are real numbers. Answer: ________
 14. Solve, and write the answer in interval notation: x + 5 0 . Answer: ________ x 1

15. A bowl of soup at 200° F. is placed in a room of constant temperature of 70° F. The temperature of the soup minutes after it is placed in the room is given by

T(t) = 70 + 130 – 0.075 t

Find the temperature of the soup 12 minutes after it is placed in the room. (Round to the nearest

degree.)

 1 16. Find the value of the logarithm: log6 . Answer: ________ 36 17. Solve: 87x 3 = 64 . Answer: ________ 18. Suppose \$9,500 is invested in an account at an annual interest rate of 7.1% compounded

continuously. How long (to the nearest tenth of a year) will it take the investment to double in size? Answer: ________

19. Let (x) = x1887.

 (a) Find the vertex. Answer: ________ (b) State the range of the function. Answer: ________ (c) On what interval is the function decreasing? Answer: ________

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 College Algebra MATH 107 Spring, 2015, V1.9 20. Consider the polynomial P(x), shown in both standard form and factored form. P(x) = 1 x4 + 3 x3 3 x2 13 x + 3 = 1 (x + 2)(x 1)(x 3)(x 4) 8 4 8 4 8

(a) Which sketch illustrates the end behavior of the polynomial function?

 A. B. C. D. vvv vvv vvvv vvv Answer: ________ (b) State the zeros of the function. Answer: ________________ (c) State the y-intercept. Answer: ________________ (d) State which graph below is the graph of P(x). Answer: ________ GRAPH A GRAPH B
 GRAPH C GRAPH D

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College Algebra MATH 107 Spring, 2015, V1.9

21. Let (x3.

 x 2 (a) State the domain. Answer: _________________ (b) State the horizontal asymptote. Answer: _________________ (c) State the vertical asymptote(s). Answer: _________________ (d) Which of the following represents the graph of f (x) = 3x 9 ? Answer: ______________ x 2 GRAPH A. GRAPH B.
 GRAPH C. GRAPH D.

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 College Algebra MATH 107 Spring, 2015, V1.9

SHORT ANSWER, with work required to be shown, as indicated.

5ab)a2

 22. Simplify: . Show work. a 5

23.Points (7, 2) and (5, –6) are endpoints of the diameter of a circle.

(a)What is the length of the diameter? Give the exact answer, simplified as much as possible.

Show work.

(b)What is the center of the circle?

(c)What is the equation of the circle?

24.Find the equation for a line which passes through the points (4, –2) and (3, 7). Write the equation in slope-intercept form. Show work.

25.Ron, a resident of Metropolis, pays Metropolis an annual tax of \$65 plus 1.4% of his annual income. If Ron paid \$863 in tax, what was Ron’s income? Show work.

26.Let (x) = 3x– 5 and g(x) = – 4.

(a)Find the composite function ( g)(x) and simplify. Show work.

(b)Find ( 1) . Show work.

27. Find the exact solutions and simplify as much as possible: 4x+ 17 = 16xShow work.

 28. Given the function f (x) = 1 x + 9 , find a formula for the inverse function. Show work. 2 4

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 College Algebra MATH 107 Spring, 2015, V1.9

29. The fuel efficiency for a particular car is given by

F(x) = –0.018 x+ 1.548 + 5.8

where is the speed of the car in miles per hour (mph) and F(x) is the corresponding fuel efficiency in miles per gallon (mpg).

(a)What is the fuel efficiency if the car’s speed is 70 mph?

(b)What speed will yield the maximum fuel efficiency? Show work.

 30. Solve: x 3 = 20 . Show work. x + 2 x2 4

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