Refer to the figure to solve the problem.A linear programing problem has the objective function 
, which is to be minimized. The following graph shows the feasible set and the straight line of all combinations of x and y for which the cost is $72. Give the linear equation (in standard form) of the line of constant cost c. Then, by inspection, find the vertex of the feasible set that gives the optimal solution. 
A. y = 
x - 
; C
B. y = - 
x + 
; B
C. y = - 
x + 
; B
D. y = 
x + 6; C
Answer: B
Mathematics
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Solve the problem.List all possible proper subsets of the set {2, 6, 7}.
A. ?, {2}, {6}, {7}, {2, 6}, {2, 7}, {6, 7} B. {2}, {6}, {7}, {2, 6}, {2, 7}, {6, 7} C. {2}, {6}, {7}, {2, 6}, {2, 7}, {6, 7}, {2, 6, 7} D. ?, {2}, {6}, {7}, {2, 6}, {2, 7}, {6, 7}, {2, 6, 7}
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Simplify the rational expression. (Assume the denominator is nonzero.)
A. 
B. 
C. 
D. 
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Multiply.(9x3)(8x2)
A. 72x5 B. -72x5 C. -72x6 D. 72x6
Mathematics
The gross domestic product (GDP) of a certain country is projected to be
?
?
billion dollars t yr from now. What will be the rate of change of the country's GDP 3 yr from now?
?
A. $10 billion/yr B. $13 billion/yr C. $15 billion/yr D. $11 billion/yr
Mathematics