he 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.

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he 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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