Find the domain of the rational expression.f(x) = 
A. 
B. {x|x is a real number and x ? 9}
C. 
D. {x|x is a real number and x ? 0}
Answer: C
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Use counting to determine the whole number that corresponds to the cardinality of the set.A = {x|x ? N and (x + 6)(x + 4) = 0}
A. Infinite B. n(A) = 4 C. n(A) = 2 D. n(A) = 6
Sketch D and g(D) from the description of D and change of variables 
x = u2 - v2, y = 2uv where D is the rectangle 0 ? u ? 1, 0 ? v ? 1
A.
 ? |  |
B.
 ? |  |
C.
 ? |  |
D.
 ? |  |
Multiply.
A. x2 + 
B. x2 + 
x + 
C. x2 + 
D. x2 + 
x + 
Solve the problem.Suppose that the total annual consumption of salmon in a certain country is given by 
and that the total annual consumption of tuna in this country is given by 
, where consumption is measured in millions of pounds and x is the number of years since 2010. When consumption of salmon reaches consumption of tuna, what is the annual consumption of salmon?
A. 894.89 million pounds B. 890.42 million pounds C. 897.87 million pounds D. 893.4 million pounds