Math 107 Final Examination Spring 2017

College Algebra MATH 107 Spring, 2017, V.1.3

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.

Record your answers and work on the separate answer sheet provided.

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.

22 2

1. Domain [– 3, 3]; Range [– 1, 3]
2. Domain [– 3, 1]; Range [– 3, 3]
3. Domain [– 1, 0.5]; Range [–1, 0]
4. Domain (–∞, 3]; Range [–1, ∞)

2. Solve: 10−3x = −x

1. –5, 2
2. 5/2
3. –5
4. No solution

1. ______

2.______

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College Algebra MATH 107

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

3. ______

1. (–∞, –1)
2. (–2,2)
3. (–∞,–3)and(1,∞)
4. (– 4.5, – 1) and (2.5, ∞)

4. Determine whether the graph of y = (x − 4)2 the x-axis, or the y-axis.

is symmetric with respect to the origin,
4. ______

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

B. C. D.

symmetric with respect to the x-axis only

symmetric with respect to the y-axis only symmetric with respect to the origin only

5. Solve, and express the answer in interval notation:

1. (–∞, −8/5] ∪ [4, ∞)
2. (–∞, –8/5]
3. [4, ∞)
4. [–8/5, 4]

| 6 – 5x | ≤ 14.

5. ______

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College Algebra MATH 107 Spring, 2017, V.1.3

6. Which of the following represents the graph of 7x + 4y = 28 ? 6. ______ A. B.

C. D.

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College Algebra MATH 107 Spring, 2017, V.1.3

7. Write a slope-intercept equation for a line parallel to the line x – 3y = 5 which passes through

the point (6, –8).

1. y=1x−8

   3

2. y=1x−10 3
3. y=−1x−6 3
4. y=−3x+10

8. Which of the following best describes the graph?

1. It is a function and it is one-to-one.
2. It is a function but not one-to-one.
3. It is not a function but it is one-to-one.
4. It is not a function and it is not one-to-one.

7. ______

8. ______

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College Algebra MATH 107
9. Write as an equivalent expression: log (x – 1) – 3 log y + log 1

A. log x   3y 

log(x−1) log(3y)

Spring, 2017, V.1.3
9. ______

B.

C. log x −1 3



y D. log(x−3y)

10. Which of the functions corresponds to the graph?

A. f(x)=−ex+2 B. f(x)=e−x+2 C. f(x)=e−x+1 D. f(x)=ex+2

10. ______

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College Algebra MATH 107

Spring, 2017, V.1.3

11. Suppose that a function f has exactly two x-intercepts. Which of the following statements MUST be true?

11. ______

A. B. C. D.

f is a linear function.
f is a quadratic function.
f is an invertible function.
The equation f (x) = 0 has exactly two real-number solutions.

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

12. ______

22 22

y = f (x)

y = g(x)

g(x) = f (x + 1) – 2 g(x) = f (x – 2) + 1 g(x) = f (x – 1) + 2 g(x) = f (x + 2) + 1

A. B. C. D.

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College Algebra MATH 107

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SHORT ANSWER:
13. Multiply and simplify: (5 − i)(8 + 3i).

Write the answer in the form a + bi, where a and b are real numbers.

14. Solve, and write the answer in interval notation: x + 2 ≤ 0 . x−9

Answer: ________

Answer: ________

15. A bowl of soup at 175° F. is placed in a room of constant temperature of 70° F. The temperature T of the soup t minutes after it is placed in the room is given by

T(t) = 70 + 105 e – 0.075 t
Find the temperature of the soup 18 minutes after it is placed in the room. (Round to the nearest

degree.)

16. Find the value of the logarithm: log  1  . 7

17. Solve: 23x+7 = 4 .

Answer:

Answer:

Answer:

________

________

________

49

18. Suppose $4,600 is invested in an account at an annual interest rate of 3.5% compounded continuously. How long (to the nearest tenth of a year) will it take the investment to double in

size?

19.Letf(x)=x2 +10x+27. (a) Find the vertex.

(b) State the range of the function.
(c) On what interval is the function decreasing?

Answer: ________

Answer: ________ Answer: ________ Answer: ________

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College Algebra MATH 107 Spring, 2017, V.1.3 20. Consider the polynomial P(x), shown in both standard form and factored form.

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

(b) State the y-intercept.
(c) State the zeros of the function.
(d) State which graph below is the graph of P(x).

Answer: ________

Answer: ________________ Answer: ________________ Answer: ________

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College Algebra MATH 107

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21.Let f(x)=2x−4 . x−3

(a) State the domain.
(b) State the horizontal asymptote.

(c) State the vertical asymptote(s).
(d) Which of the following represents the graph of f (x) = 2x − 4 ?

x−3 GRAPH A. GRAPH B.

GRAPH C. GRAPH D.

Answer: _________________ Answer: _________________

Answer: _________________ Answer: ______________

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College Algebra MATH 107 Spring, 2017, V.1.3

SHORT ANSWER, with work required to be shown, as indicated. 22.Let f(x)=x–7 and g(x)= x−3.

f
(a) Find (12) . Show work.

g
(b) Find the domain of the quotient function f . Explain.

g

23. Points (–7, 9) and (–3, 5) 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 point C of the circle?
(c) Given the point C you found in part (b), state the point symmetric to C about the x-axis.

24. Find the equation for a line which passes through the points (–5, 7) and (–2, 1). Write the equation in slope-intercept form. Show work.

25. Dave, a resident of Metropolis, pays Metropolis an annual tax of $58 plus 1.9% of his annual income. If Dave paid $1,255 in tax, what was Dave’s income? Show work.

26.Letf(x)=2×2 –8 and g(x)=x–4.
(a) Find the composite function ( f o g)(x) and simplify. Show work.

(b)Find (f og)(1).Showwork.

27. Find the exact solutions and simplify as much as possible: 6×2 + 5 = 12x. Show work.

28.Giventhefunction f(x)=5+1x, findaformulafortheinversefunction.Showwork. 7

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College Algebra MATH 107 Spring, 2017, V.1.3

29. Donut Delights, Inc. has determined that when x donuts are made daily, the profit P, in dollars, is given by

P(x) = –0.001 x2 + 3.2x – 1450
(a) What is the company’s profit if 1,000 donuts are made daily?

(b) How many donuts should be made daily in order to maximize the company’s profit? Show work.

30.Solve: x+7+ 24 =0.Showwork. x+3 x2−9

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