The majority of American adults use their smartphones to go online. The bar graph shows the percentage of American using phones to go online from 2009 through 2013. Source: Pew Internet and American Life Project The data in the graph can be modeled by the formula S = 32 + 8.7 x − 0.3 x 2 , where S represents the percentage of American adults using smartphones to go online x years after 2009. Use this formula to solve Exercises 93 –94 . According to the formula, what percentage of American adults used smartphones to go online in 2013? Does this underestimate or overestimate the actual percent shown by the bar graph? By how much? The formula C = 5 9 ( F − 32 )
The majority of American adults use their smartphones to go online. The bar graph shows the percentage of American using phones to go online from 2009 through 2013. Source: Pew Internet and American Life Project The data in the graph can be modeled by the formula S = 32 + 8.7 x − 0.3 x 2 , where S represents the percentage of American adults using smartphones to go online x years after 2009. Use this formula to solve Exercises 93 –94 . According to the formula, what percentage of American adults used smartphones to go online in 2013? Does this underestimate or overestimate the actual percent shown by the bar graph? By how much? The formula C = 5 9 ( F − 32 )
Solution Summary: The author calculates the percentage of American adults who used smart phones to go online in 2012 according to the formula.
The majority of American adults use their smartphones to go online. The bar graph shows the percentage of American using phones to go online from 2009 through 2013.
Source: Pew Internet and American Life Project
The data in the graph can be modeled by the formula
S
=
32
+
8.7
x
−
0.3
x
2
,
where S represents the percentage of American adults using smartphones to go online x years after 2009. Use this formula to solveExercises 93 –94.
According to the formula, what percentage of American adults used smartphones to go online in 2013? Does this underestimate or overestimate the actual percent shown by the bar graph? By how much?
Assume {u1, U2, u3, u4} does not span R³.
Select the best statement.
A. {u1, U2, u3} spans R³ if u̸4 is a linear combination of other vectors in the set.
B. We do not have sufficient information to determine whether {u₁, u2, u3} spans R³.
C. {U1, U2, u3} spans R³ if u̸4 is a scalar multiple of another vector in the set.
D. {u1, U2, u3} cannot span R³.
E. {U1, U2, u3} spans R³ if u̸4 is the zero vector.
F. none of the above
Select the best statement.
A. If a set of vectors includes the zero vector 0, then the set of vectors can span R^ as long as the other vectors
are distinct.
n
B. If a set of vectors includes the zero vector 0, then the set of vectors spans R precisely when the set with 0
excluded spans Rª.
○ C. If a set of vectors includes the zero vector 0, then the set of vectors can span Rn as long as it contains n
vectors.
○ D. If a set of vectors includes the zero vector 0, then there is no reasonable way to determine if the set of vectors
spans Rn.
E. If a set of vectors includes the zero vector 0, then the set of vectors cannot span Rn.
F. none of the above
Assume {u1, U2, u3, u4} does not span R³.
Select the best statement.
A. {u1, U2, u3} spans R³ if u̸4 is a linear combination of other vectors in the set.
B. We do not have sufficient information to determine whether {u₁, u2, u3} spans R³.
C. {U1, U2, u3} spans R³ if u̸4 is a scalar multiple of another vector in the set.
D. {u1, U2, u3} cannot span R³.
E. {U1, U2, u3} spans R³ if u̸4 is the zero vector.
F. none of the above
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