The surface area S of an 8-in. high can is given by 
, where r is the length of the radius.
a) Find the rate of change of the surface area with respect to the length of the radius.
b) What is the surface area of a can that is 8-in. high and has a radius of 2 in.?
c) Find the rate of change at r = 2 in.
(a) dS/dr = 4?r + 16r
(b) 40? 
(c) 24? 
/in.
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? 
A. 
B. 
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D. 
For the given pair of variables determine whether a is a function of b, b is a function of a, both, or neither.a is the number of years of formal education of an adult living in the United States, and b is his or her age in years.
A. Both B. Neither C. a is a function of b D. b is a function of a
Determine the row operation that was used on the first matrix to obtain the second matrix.
, 
What will be an ideal response?
Find the difference.69.19 - 35
A. 34.19 B. 34.29 C. 104.19 D. 34.69