Divide the interval into n subintervals and list the value of ?x and the midpoints 
of the subintervals. -1 ? x ? 2; n = 6
A. ?x = 0.5; x1 = -0.5, x2 = 0, x3 = 0.5, x4 = 1, x5 = 1.5, x6 = 2
B. ?x = 0.5; x1 = -0.5, x2 = -0.25, x3 = 0.25, x4 = 0.75, x5 = 1.25, x6 = 2
C. ?x = 0.25; x1 = -0.75, x2 = -0.25, x3 = 0.25, x4 = 0.75, x5 = 1.25, x6 = 1.75
D. ?x = 0.5; x1 = -0.75, x2 = -0.25, x3 = 0.25, x4 = 0.75, x5 = 1.25, x6 = 1.75
Answer: D
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