College Algebra 9th txtbk

Student Answer Appendix
SA-19
93. (A) C(n) 25n 175 2,500 95. (A) L(x) 2x 450
n
x
(B) 10 yr (B) (0, )
(C) C
(C) 15 ft by 15 ft
2,000
(D) L
200
1,000
100
0
25
50
n
0
25
50
x
Chapter 4 Review Exercise
1. Zeros: 1, 3; turning points: (1, 0), (1, 2), (3, 0); P(x) S as x S and P(x) S as x S (4-1)
9. 1, 3, 5, 15, 1 5 , 3 5
(4-3)
11. (A) Domain: all real numbers except 5; x intercept: 0 (B) Domain: all real numbers except 4 and 2; x intercept: 3 7
13. The graph does not increase or decrease without bound as x S and as x S (4-1)
(4-4)
29. (x 1)(2x 1) ax 1 i13 b ax 1 i13 b
2
2
(4-3)
33. (A) Upper bound: 7; lower bound: 5 (B) Four intervals (C) 4.67, 6.62 (4-2)
47. (A) 3 (B) 3 2 3i13
2
(4-3) 49. y
(4-4)
5
5
5
x
5
1T
53. 3: None of the candidates for rational zeros (1, 2, and 4) are actually zeros. (4-3) 59. v k (4-5)
1w
63. (A)
(B) 1,915
CHAPTER 5 Exercises 5-1
25. The graph of g is the same as the graph of f stretched 27. The graph of g is the same as the graph of f reflected
vertically by a factor of 3; g is increasing;
through the y axis and shrunk vertically by a factor
horizontal asymptote: y 0
1
of 3; g is decreasing; horizontal asymptote: y 0
y
y
10
10
5 5
x
5 5
x
10
29. The graph of g is the same as the graph of f shifted upward 31. The graph of g is the same as the graph of f shifted 2 units
2 units; g is increasing; horizontal asymptote: y 2 to the left; g is increasing; horizontal asymptote: y 0
y
10
y
10
10
5 5
x
5 5
x
10
10