A firm's weekly profit (in dollars) in marketing two products is given by
?
?
where 
and 
represent the numbers of units of each product sold weekly. Estimate the average weekly profit when 
varies between 40 and 50 units and 
varies between 45 and 50 units.
A. $12,300
B. $11,100
C. $13,400
D. $21,760
E. $16,450
Answer: C
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A. (3x + 4)(3x + 2) B. prime C. (3x - 4)(3x - 2) D. (9x + 4)(x + 2)
Match the surface show below to the graph of its level curves.
A. 
B. 
C. 
D. 
Provide an appropriate response.Fill in the blank to make the trinomial a perfect square: x2 + 5x + 
A. 0
B. - 
C. - 
D. 
Find the domain of f(x).f(x) = -2x + 3
A. {x? x is a real number and x ? -2}
B. {x? x is a real number and x ? - 
}
C. {x? x is a real number and x ? 3}
D. ? the set of all real numbers