of I and E (in billions of dollars per year) during each period.† A scatter plot titled Trade Deficit has a horizontal axis labeled t = Year (0 ↔ 1980) with values from 0 to 35 and a vertical axis labeled Value of goods (in billions of dollars) with values from 0 to 2,400. There are two groups of points on the scatterplot. The group of points labeled I has 34 points. A pattern goes up and right becoming more steep from (0, 250) to (33, 2,300). The points are as follows.  (0, 250)  (1, 270)  (2, 250)  (3, 270)  (4, 330)  (5, 340)  (6, 370)  (7, 410)

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Chapter1: Functions And Models
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Trade Deficit

 The graph shows the values I (in billions of dollars) of goods imported to the United States and the values E (in billions of dollars) of goods exported from the United States from 1980 through 2013. Approximate the average rates of change of I and E (in billions of dollars per year) during each period.†
A scatter plot titled Trade Deficit has a horizontal axis labeled t = Year (0 ↔ 1980) with values from 0 to 35 and a vertical axis labeled Value of goods (in billions of dollars) with values from 0 to 2,400. There are two groups of points on the scatterplot.
  • The group of points labeled I has 34 points. A pattern goes up and right becoming more steep from (0, 250) to (33, 2,300). The points are as follows. 
    • (0, 250) 
    • (1, 270) 
    • (2, 250) 
    • (3, 270) 
    • (4, 330) 
    • (5, 340) 
    • (6, 370) 
    • (7, 410) 
    • (8, 450) 
    • (9, 480) 
    • (10, 500) 
    • (11, 490) 
    • (12, 540) 
    • (13, 590) 
    • (14, 670) 
    • (15, 750) 
    • (16, 800) 
    • (17, 880) 
    • (18, 920) 
    • (19, 1,040) 
    • (20, 1,230) 
    • (21, 1,150) 
    • (22, 1,170) 
    • (23, 1,270) 
    • (24, 1,490) 
    • (25, 1,700) 
    • (26, 1,880) 
    • (27, 1,990) 
    • (28, 2,140) 
    • (29, 1,580) 
    • (30, 1,940) 
    • (31, 2,240) 
    • (32, 2,300) 
    • (33, 2,290)
  • The group of points labeled E has 34 points. A pattern goes up and right becoming more steep from (0, 200) to (33, 1,590). The points are as follows. 
    • (0, 220) 
    • (1, 240) 
    • (2, 210) 
    • (3, 200) 
    • (4, 220) 
    • (5, 220) 
    • (6, 220) 
    • (7, 250) 
    • (8, 320) 
    • (9, 360) 
    • (10, 390) 
    • (11, 410) 
    • (12, 440) 
    • (13, 460) 
    • (14, 500) 
    • (15, 580) 
    • (16, 610) 
    • (17, 680) 
    • (18, 670) 
    • (19, 700) 
    • (20, 780) 
    • (21, 730) 
    • (22, 700) 
    • (23, 730) 
    • (24, 820) 
    • (25, 910) 
    • (26, 1,040) 
    • (27, 1,170) 
    • (28, 1,310) 
    • (29, 1,070) 
    • (30, 1,290) 
    • (31, 1,500) 
    • (32, 1,560) 
    • (33, 1,590)
(a)
Imports: 1980–1990
$  billion per year
(b)
Exports: 1980–1990
$  billion per year
(c)
Imports: 1990–2000
$  billion per year
(d)
Exports: 1990–2000
$  billion per year
(e)
Imports: 2000–2010
$  billion per year
(f)
Exports: 2000–2010
$  billion per year
(g)
Imports: 1980–2013
$  billion per year
(h)
Exports: 1980–2013
$  billion per year
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