Show that the function 
is concave upward wherever it is defined.
?
A. The function 
is defined for any value of x and 
hence the function is concave upward for any x.
B. The second derivative of 
is 
. It is positive for any value of x, hence the function is concave upward for any x.
C. The first derivative of 
is 
. It is positive for any value of x, hence the function is concave upward for any x.
Answer: B
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Find the area of the specified region.Inside the circle r = -8 cos ? and outside the circle r = 4
A. 8?
B. 
?
C. 
(2? + 3
)
D. 
(4? - 3
)
Provide an appropriate response.True or False? Every integer is a whole number.
A. True B. False
Write the repeating decimal using an ellipsis.0.
A. 0.8
B. 0.
. . .
C. 0.888 . . .
D. 8.888 . . .
Provide an appropriate response.When solving a logarithmic equation, why must you always check that each solution works in the original equation?
What will be an ideal response?