Use the given vectors to find the specified scalar.u = -4i - 12j and v = -8i - 11j; Find u ? v.
A. 32
B. 132
C. -100
D. 164
Answer: D
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Sketch a typical level surface for the function.f(x, y, z) = 
A. 
B. 
C. 
D. 
Multiply and simplify.
? 3b
A. 
b
B. 
C. 
D. 11b
Find the value of r and determine if a correlation exists at the indicated level of significance.
?? = 0.05
A. r = 0.9717; Correlation exists. B. r = 0.9717; Correlation does not exist. C. r = 0.9172; Correlation exists. D. r = -0.9717; Correlation exists.
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 
Graph f in [0,85,5] by 
Then, use the intersection-of-graphs method to estimate the x-values where 75% to 95% of the pollutants are removed.
height="180" width="180" />
A. 75% to 95% are removed when
about 36 to 47 liters of air are
filtered.
B. 75% to 95% are removed when
about 25 to 33 liters of air are
filtered.
C. 75% to 95% are removed when
about 45 to 56 liters of air are
filtered.
D. 75% to 95% are removed when
about 27 to 36 liters of air are
filtered.