Find the maximum or minimum value of the given objective function of a linear programming problem. The figure illustrates the graph of the feasible points.z = 7x + 8y. Find maximum and minimum. 
A. maximum value: 98; minimum value: 24
B. maximum value: 66; minimum value: 21
C. maximum value: 98; minimum value: 21
D. maximum value: 66; minimum value: 24
Answer: C
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Calculate the flux of the field F across the closed plane curve C.F = y3i + x3j; the curve C is the closed counterclockwise path formed from the semicircle 
0 ? t ? ?, and the straight line segment from (-2, 0) to (2, 0)
A. - 4 B. 0 C. 4 D. 8
Rewrite without rational exponents, and simplify, if possible.(16x)7/2
A. 2
B. 128
C. 16,384x3
D. 16,384
Write the reciprocal of the number.- 
A. 
B. 16
C. -16
D. - 
Solve the system mentally, without the use of a calculator or pencil-and-paper calculation. Try to visualize the graphs of both lines.x + 0y = 90x + y = 4
A. x = 9; y = 4
B. x = 4; y = 9
C. x = 9; y = 2
D. x = 2; y = 