Find the maximum or minimum value of the given objective function of a linear programming problem. The figure illustrates the graph of feasible points. 
z = -5x - y. Find maximum.
A. maximum: -22
B. maximum: -15
C. maximum: -18
D. no maximum
Answer: B
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Compute the gradient of the function at the given point.
A. ?f = 
j - 
k
B. ?f = - 
j - 
k
C. ?f = - 
j + 
k
D. ?f = - 
j - 
k
Solve the problem.The following graph shows data for a recent train ride from New York to Toronto. At what rate did the train travel?
A. 60 miles per hour B. 50 miles per hour C. 65 miles per hour D. 120 miles per hour
Solve the logarithmic equation. Be sure to reject any value that is not in the domain of the original logarithmic expressions. Give the exact answer.log2x = 5
A. {25} B. {2.32} C. {10} D. {32}
Solve the problem.Determine whether the graphs of the lines with the given equations are parallel, perpendicular, or neither.L1: 3x - 6y = -10L2: 18x + 9y = -10
A. Parallel B. Perpendicular C. Neither