3_6 - Chapter 3 Functions and Their Graphs 3.6 1. 2....

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Chapter 3 352 Functions and Their Graphs 3.6 Mathematical Models; Constructing Functions 1. V = r 2 h , h = 2 r V r ( 29 = r 2 2 r ( 29 = 2 r 3 2. V = 1 3 r 2 h , h = 2 r V r ( 29 = 1 3 r 2 2 r ( 29 = 2 3 r 3 3. (a) R ( x ) = x - 1 6 x + 100  = - 1 6 x 2 + 100 x (b) R (200) = - 1 6 (200) 2 + 100(200) = - 20,000 3 + 20,000 = 40,000 3 $13,333 (c) 600 16000 0 0 (d) x = 300 maximizes revenue R (300) = - 1 6 (300) 2 + 100(300) = - 15,000 + 30,000 = $15,000 = maximum revenue (e) p = - 1 6 (300) + 100 = - 50 + 100 = $50 maximizes revenue 4. (a) R ( x ) = x - 1 3 x + 100  = - 1 3 x 2 + 100 x (b) R (100) = - 1 3 (100) 2 + 100(100) = - 10,000 3 + 10,000 = 20,000 3 $6666.67 (c) 300 0 8000 0 (d) x = 150 maximizes revenue R (150) = - 1 3 (150) 2 + 100(150) = - 7500 + 15,000 = $7500 = maximum revenue (e) p = - 1 3 (150) + 100 = - 50 + 100 = $50 maximizes revenue
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Section 3.6 Mathematical Models; Constructing Functions 353 5. (a) If x = - 5 p + 100, then p = 100 - x 5 . R ( x ) = x 100 - x 5  = - 1 5 x 2 + 20 x (b) R (15) = - 1 5 (15) 2 + 20(15) = - 45 + 300 = $255 (c) 100 600 0 0 (d) x = 50 maximizes revenue R (50) = - 1 5 (50) 2 + 20(50) = - 500 + 1000 = $500 = maximum revenue (e) p = 100 - 50 5 = 50 5 = $10 maximizes revenue 6. (a) If x = - 20 p + 500, then p = 500 - x 20 . R ( x ) = x 500 - x 20  = - 1 20 x 2 + 25 x (b) R (20) = - 1 20 (20) 2 + 25(20) = - 20 + 500 = $480 (c) 500 0 4000 0 (d) x = 250 maximizes revenue R (250) = - 1 20 (250) 2 + 25(250) = - 3125 + 6250 = $3125 = maximum revenue (e) p = 500 - 250 20 = 250 20 = $12.50 maximizes revenue 7. (a) Let x = width and y = length of the rectangular area. P = 2 x + 2 y = 400 y = 400 - 2 x 2 = 200 - x Then A ( x ) = (200 - x ) x = 200 x - x 2 = - x 2 + 200 x (b) We need x 0 and y 0 200 - x 0 200 x So the domain of A is x 0 x 200 { } (c) 200 10000 0 0 x = 100 yards maximizes area
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Chapter 3 Functions and Their Graphs 354 8. (a) Let x = length and y = width of the rectangular field. P
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3_6 - Chapter 3 Functions and Their Graphs 3.6 1. 2....

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