ANSWERS TO ODD NUMBERED PROBLEMS

Section 1.1

1 (a) (IV)

(b) (II)

(c) (III)

3 Increasing

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5 Decreasing

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7 Argentina produced 14 million metric tons of wheat in 2010

9 (a) 8; 7

(b) 10

11 f(5) = 25

13 f(5) = 2

15 (a) 2

(b) 11

(c) 3 and −3

(d) No

17 f(0) meters

19 f(0) = f(1) + 0.001

23 Greatest number of species at intermediate number of snails; yes

25 (a) $1000

(b) About $2200

(c) About 20 years

27

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29

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35

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37

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Section 1.2

1 y = (1/2)x + 2

3 y = (1/2)x + 2

5 Slope:−12/7

Vertical intercept: 2/7

7 Slope: 2

Vertical intercept: −2/3

9 (a) l1

(b) l3

(c) l2

(d) l4

11 (a) P = 30,700 + 850t

(b) 39,200 people

(c) In 2026

13 (a) 300 miles

(b) 50 mph

(c) D = 300 + 50t

15 (a) y = −2x + 27

(b) s = 2t + 32

17 (a) 1.8 billion dollars/year

(b) 19.1 billion dollars

(c) 37.1 billion dollars

(d) 2013

19 (a) About 480 million tons

(b) About 10 million tons/year

(c) M = 480 + 10t

21 (a) P = 1241 + 26.9t

(b) 26.9 ...

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