Oil Imports from Mexico Crude oil imports to the United States from Mexico for 2009–2013 could be approximated by I ( t ) = − 39 t 2 + 800 t − 3 , 000 thousand barrels per day ( 9 ≤ t ≤ 13 ) where t is time in years since the start of 2000. 3 According to the model, approximately when were oil imports to the United States greatest? How many barrels per day were imported at that time? (Round the answer to two significant digits.) [ HINT: See Example 1.]
Oil Imports from Mexico Crude oil imports to the United States from Mexico for 2009–2013 could be approximated by I ( t ) = − 39 t 2 + 800 t − 3 , 000 thousand barrels per day ( 9 ≤ t ≤ 13 ) where t is time in years since the start of 2000. 3 According to the model, approximately when were oil imports to the United States greatest? How many barrels per day were imported at that time? (Round the answer to two significant digits.) [ HINT: See Example 1.]
Solution Summary: The author calculates the year in which the oil import to the United States from Mexico is greatest, and the amount of oil in barrels per day imported at that time.
Oil Imports from Mexico Crude oil imports to the United States from Mexico for 2009–2013 could be approximated by
I
(
t
)
=
−
39
t
2
+
800
t
−
3
,
000
thousand barrels per day
(
9
≤
t
≤
13
)
where t is time in years since the start of 2000.3 According to the model, approximately when were oil imports to the United States greatest? How many barrels per day were imported at that time? (Round the answer to two significant digits.) [HINT: See Example 1.]
America is getting older. The graph shows the projected elderly U.S. population for ages 65–84 and for ages 85 and older.The formula E = 5.8√x + 56.4 models the projected number of elderly Americans ages 65–84, E, in millions, x years after 2020.a. Use the formula to find the projected increase in the number of Americans ages 65–84, in millions, from 2030 to 2060. Express this difference in simplified radicalform.b. Use a calculator and write your answer in part (a) to the nearest tenth. Does this rounded decimal overestimate or underestimate the difference in the projected data shown by the bar graph ? By how much?
Chapter 2 Solutions
Student Solutions Manual for Waner/Costenoble's Applied Calculus, 7th
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