Compute.
A. -6
B. 
C. 6
D. -540
Answer: C
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Find projv u.v = k, u = 2i + 6j + 9k
A. 
k
B. 
i + 
j + 
k
C. 9k
D. 
i + 
j + 
k
Find the real solutions of the equation.
= 2
A. {9} B. {4} C. {3} D. {5}
Solve the problem.The function defined by 
gives the distance in feet that a car going approximately 
will skid in t seconds. Find the time it would take for the car to skid 
. Round to the nearest tenth.
A. 10.1 sec B. 10.3 sec C. 9.9 sec D. 8.9 sec
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.
height="201" width="180" />
A. 
75% to 90% are removed when
about 46 to 55 liters of air are
filtered.
B. 
75% to 90% are removed when
about 38 to 46 liters of air are
filtered.
C. 
75% to 90% are removed when
about 25 to 31 liters of air are
filtered.
D. 
75% to 90% are removed when
about 31 to 38 liters of air are
filtered.