Chapter 10 Esponential and Logarithmic Relations Lesson 10-1 ...
Chapter 10 Esponential and Logarithmic Relations Lesson 10-1 Exponential Functions Pages 527?530
1. Sample answer: 0.8
3. c 5. b
2a. quadratic 2b. exponential 2c. linear 2d. exponential
4. a
6. D {x 0 x is all real numbers.}, R {y 0 y 0}
y
7. D {x 0 x is all real numbers.}, R {y 0 y 0}
y
y 3(4)x
O
x
8. growth
( ) y 2
1 3
x
O
x
9. decay 11. y 3a12bx 13. 2227 or 427 15. 3322 or 2722 17. x 0 19. y 65,000(6.20)x
10. growth
12. y 18132x
14. a4 16. 9 18. 2 20. 22,890,495,000
?Glencoe/McGraw-Hill
267
Algebra 2 Chapter 10
21. D {x 0 x is all real numbers.}, R {y 0 y 0}
y
22. D {x 0 x is all real numbers.}, R {y 0 y 0}
y
y 2(3)x
O
x
y 5(2)x
O
x
23. D {x 0 x is all real numbers.}, R {y 0 y 0}
y
y 0.5(4)x
24. D {x 0 x is all real numbers.}, R {y 0 y 0}
y
( ) y 4
1 3
x
O
x
25. D {x 0 x is all real numbers.}, R {y 0 y 0}
y x
O
( ) y
1 5
x
O
x
26. D {x 0 x is all real numbers.}, R {y 0y 0}
y
O
x
y 2.5(5)x
27. growth
29. decay
31. decay
33.
y
2
1x a4b
35. y 7(3)x
37. y 0.2(4)x
?Glencoe/McGraw-Hill
28. growth 30. growth 32. decay
34. y 3(5)x
36.
y
5
1x a3b
38. y 0.3(2)x
268
Algebra 2 Chapter 10
39. 54 or 625 41. 7412 43. n 2
45. n 5
47. 1
49.
8
3
51. n 3
53. 3 55. 10 57. y 100(6.32)x 59. y 3.93(1.35)x
61. 2144.97 million; 281.42 million; No, the growth rate has slowed considerably. The population in 2000 was much smaller than the equation predicts it would be.
63. A(t ) 1000(1.01)4t
65. s . 4x
67. Sometimes; true when b 1, but false when b 1.
40. x115 42. y 2 13
44. 25
46.
2 3
48. n 2
50. 0
52.
5 3
54. p 2
56. 3, 5
58. about 1,008,290
60. 9.67 million; 17.62 million;
32.12 million; These answers
are in close agreement with
the actual populations in
those years.
62.
Exponential; the base, 1 r ,
n
is fixed, but the exponent, nt,
is variable since the time t
can vary.
64. $2216.72
66. 1.5 three-year periods or 4.5 yr
68. The number of teams y that could compete in a tournament with x rounds can be expressed as y 2x. The 2 teams that make it to the final round got there as a result of winning games played with 2 other teams, for a total of 2 2 22 or 4 games played in the previous rounds. Answers should include the following.
?Glencoe/McGraw-Hill
269
Algebra 2 Chapter 10
69. A 71.
? Rewrite 128 as a power of 2, 27. Substitute 27 for y in the equation y 2x. Then, using the Property of Equality for Exponents, x must be 7. Therefore, 128 teams would need to play 7 rounds of tournament play.
? Sample answer: 52 would be an inappropriate number of teams to play in this type of tournament because 52 is not a power of 2.
70. 780.25
72.
[5, 5] scl: 1 by [1, 9] scl: 1
The graphs have the same
shape. The graph of y 2x 3 is the graph of y 2x translated three units
up. The asymptote for the graph of y 2x is the line y 0 and for y 2x 3 is
the line y 3. The graphs
have the same domain, all
real numbers, but the range of y 2x is y 0 and the range of y 2x 3 is y 3.
The y-intercept of the graph of y 2x is 1 and for the graph of y 2x 3 is 4.
[5, 5] scl: 1 by [1, 9] scl: 1
The graphs have the same
shape. The graph of y 3x1 is the graph of y 3x translated one unit to
the left. The asymptote for the graph of y 3x and for y 3x1 is the line y 0.
The graphs have the same
domain, all real numbers,
and range, y 0. The
y-intercept of the graph of y 3x is 1 and for the graph of y 3x1 is 3.
?Glencoe/McGraw-Hill
270
Algebra 2 Chapter 10
73.
74.
[5, 5] scl: 1 by [1, 9] scl: 1
The graphs have the same shape. The graph of
y
1 x2 a5b
is
the
graph
of
y
1x a5b
translated
two
units
to the right. The asymptote
for
the
graph
of
y
1x a5b
and
for
y
1 x2 a5b
is
the
line
y 0. The graphs have the same domain, all real numbers, and range, y 0. The y-intercept of the graph
of
y
1x a5b
is
1
and
for
the
graph
of
y
1 x2 a5b
is
25.
75. For h 0, the graph of y 2x is translated 0h 0 units
to the right. For h 0, the graph of y 2x is translated
|h| units to the left. For k 0, the graph of y 2x is
translated 0k 0 units up. For k 0, the graph of y 2x is
translated 0k 0 units down.
[5, 5] scl: 1 by [3, 7] scl: 1
The graphs have the same shape. The graph of
y
a
1 4
x
b
1
is
the
graph
of
y
1x a4b
translated
one
unit down. The asymptote
for
the
graph
of
y
1x a4b
is
the line y 0 and
for
the
graph
of
y
1x a4b
1
is the line y 1. The graphs have the same domain, all real numbers,
but
the
range
of
y
1x a4b
is
y
0
and
of
y
1x a4b
1
is y 1. The y-intercept
of
the
graph
of
y
1x a4b
is
1
and for the graph of
y
1x a4b
1
is
0.
76. 1, 15
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271
Algebra 2 Chapter 10
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