Find the derivative of the function.y = log (6x)
A. 
B. 
C. 
D. 
Answer: B
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Solve the problem.Find the centroid of the first-octant portion of a solid ball of radius 1 centered at the origin.
A. (
, 
, 
) = 
B. (
, 
, 
) = 
C. (
, 
, 
) = 
D. (
, 
, 
) = 
Use the table of values of f to estimate the limit.Let f(x) = 
, find 
f(x).
A. 
; limit = 0.4
B. 
; limit = -0.5
C. 
; limit = 0.6
D. 
; limit = 0.5
Solve the problem.A certain electronic air cleaner is capable of filtering x liters of air per second and the percentage of the contaminants that are removed from the air may be calculated by 
where 
(i) Graph f in [0, 85, 5] by 
(ii) Use the intersection-of-graphs method to estimate the x-values where 75% to 90% of the pollutants are removed.
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A. 
75% to 90% are removed when
about 42 to 50 liters of air are
filtered.
B. 
75% to 90% are removed when
about 25 to 30 liters of air are
filtered.
C. 
75% to 90% are removed when
about 35 to 43 liters of air are
filtered.
D. 
75% to 90% are removed when
about 26 to 31 liters of air are
filtered.
Write in scientific notation.0.0000020119
A. 2.0119 × 10-7 B. 2.0119 × 10-6 C. 2.0119 × 106 D. 2.0119 × 10-5